{
  "manageEntity": {
    "action": "Save",
    "entityId": "891375947",
    "entityType": "Track",
    "nonce": "0x023b989904f6e9ee5ac6c575ddd9a9dea7d38eead17ce9e3cf415ae378e0b1a9",
    "signature": "0xac6c6f14675cbb667b801388e6cf3506a5ee16c84616fd19ef0971b0fb4ed91d593437c0d608cef0f77a7bb301b226036d1db9bd40929c2bb9d089138b524edf1c",
    "signer": "0xC6f6979d7215C4611Cd7aDb30a42B2812294262c",
    "userId": "55290787"
  }
}