{
  "manageEntity": {
    "action": "Save",
    "entityId": "651678",
    "entityType": "Track",
    "nonce": "0x2027a54b14328944db2294e1d2d56495f0ab12ff091e220d2a0eb5b2f8b1ffa0",
    "signature": "0x5b37c8717471cf30edfa2c2b7bc471e809f1137391a7b7654558bf66091bd116541ac09a611b2801c5c69c75b10e7498441057c9e89f8b2508e3299363b3c2df1b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}