{
  "manageEntity": {
    "action": "Save",
    "entityId": "721156628",
    "entityType": "Track",
    "nonce": "0x7c9bdea5b265f1db3e44bc873c8e3a7c8400a9b18f54f113a72a4a5272d271be",
    "signature": "0x3f9e8f0281cf01ea519fd4e47e980d4e240235724e4c01674590f25f896e5a5c2b7f95eb9e42a8cf0a307eede53d761600f3fb87fffab150a0d20ab8068ed59c1c",
    "signer": "0x204E506f1D5498d2CABD41d2fc7a3078d5792835",
    "userId": "768479471"
  }
}