{
  "manageEntity": {
    "action": "Save",
    "entityId": "502387264",
    "entityType": "Track",
    "nonce": "0x2a7f43240fa5f9ff2c2117286ab0e0b9bb9ef9105e76d5518f2ddc7116326124",
    "signature": "0x16b087d143e14f73925eb82061d6228d5c14f89d9aaa99e7f4685c0cd96bbd1221ddbc2420815f380eb263b4697b6acad733eb5417a70df95bbdce799c4a36a01c",
    "signer": "0x4D8EDeF47b57f98c89BDFf851267B0327BE4cD05",
    "userId": "5307724"
  }
}