{
  "manageEntity": {
    "action": "Save",
    "entityId": "474054817",
    "entityType": "Track",
    "nonce": "0xfee37e896e6d68e3ec5077f45c84844cc312ad032955668682965d9c793f6662",
    "signature": "0x6e0a400a895748186fd366b1fd6f67fb6f0912460cef1752a42d0b9cb2860f865e295103cf8451e05e4c6031813e66a0f4532ad9bc7d658de866b8109cdb980b1c",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}