{
  "manageEntity": {
    "action": "Save",
    "entityId": "649383806",
    "entityType": "Track",
    "nonce": "0x02b7d8420ff97f34e96f2560ced2602642161734a06a1a3e5330e396d3bfdb55",
    "signature": "0xd5e524c53663cc52e836bc3d4fb202b8e05db728689aa4c528857fb7cf1430a71b7c0a7951dd86b58c2bd950b94d77dba50604770acc17e1e9252ee9634de8fb1c",
    "signer": "0x6068Da6B0a791A756931bE32de98D46eBb95890c",
    "userId": "475275462"
  }
}