{
  "manageEntity": {
    "action": "Save",
    "entityId": "899936699",
    "entityType": "Track",
    "nonce": "0x329b40de3e1656d7656012bc5e39384a47ebb8e947a1af06dec1318539b739c4",
    "signature": "0x014ab8634bf96e571e58ca938faf6081345f61c990fae7cb69f17cd1fe3ea7ec676ea040e9a2a52488822beb77fa21730db28a5e4ed1ab85caacd181cfda897e1b",
    "signer": "0xD9254B079e0e1571E56512C57188F2eec899054f",
    "userId": "854498636"
  }
}