{
  "manageEntity": {
    "action": "Save",
    "entityId": "898270499",
    "entityType": "Track",
    "nonce": "0x4ace993db75d6de543ca60dfc5ac19fcb99c09b393a93d9f4a0252ff620a59a5",
    "signature": "0x58f3c3707b3be8cba7b3f375a47c5837fb61ae3ff9fa18169a1c5ccf200144ba7473ed8b8b8a354fd11e4db91b2447b6d11731b9ac66e0cfdf1d4e5a7fec26861b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}