{
  "manageEntity": {
    "action": "Save",
    "entityId": "989067520",
    "entityType": "Track",
    "nonce": "0x3921b9e61477f2480d64aa861247298b74d4135540198c5b7b7514033fa9ff34",
    "signature": "0xbc4b19b832b7d1d1934986a60f1ccbce1321bd92c472bc930108fa0d7a5fb3c047cab2abedec4adac48d592150f620828fad23cd7b1965a559af831fddb2205c1b",
    "signer": "0xc97A6025Ad8c7Ba1a35Ef7E3A3b88ABc8b2013BF",
    "userId": "666092734"
  }
}