{
  "manageEntity": {
    "action": "Save",
    "entityId": "1375659637",
    "entityType": "Track",
    "nonce": "0x2923f55eec711fb77652ce81b685b7c0f59a1bdffe62054021e185f63fc09b7a",
    "signature": "0x46a77938075ba413eee6fb08af5356326a7238cdf69ac218973ee7b5bd74d03a172e90a6aef6be7125cb17b4a394b943c42fc76417a4ef6c8f772516bf596fcb1c",
    "signer": "0xfBD2B2a59726b49e1d17c6691F6E33AC362664Eb",
    "userId": "173775879"
  }
}