{
  "manageEntity": {
    "action": "Save",
    "entityId": "368579",
    "entityType": "Track",
    "nonce": "0x68853400dc9c50749755eae00c0f46699d023414091c5d883452c2132835178b",
    "signature": "0x5db233ca7f6e78d2929753a1f0024d9548fb721f841e163cae07bb3c0f8da6a215c6e75da67b49590dffc63579fd3793ad00fdb26c1921c2c38d5bd0d232df981b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}