{
  "manageEntity": {
    "action": "Save",
    "entityId": "1869654961",
    "entityType": "Track",
    "nonce": "0xee479c9e77312d420f93d90a141762ccb72bbea4a94963a39d98fdbb87ae875f",
    "signature": "0xe77757c485b1a472858f2d43387e7a2f25804fb8516c42cd87955c51feb37391636526e8b7d62140fd3b17985f53782975bb00c7047f89f09f2b181eb41ec0711c",
    "signer": "0x45c4f1dcE13eeF476C74C5758696D56137253980",
    "userId": "824478223"
  }
}