{
  "manageEntity": {
    "action": "Save",
    "entityId": "1841956380",
    "entityType": "Track",
    "nonce": "0x64c65e7b1ef830bfbc0b416ee4568999077c65e6c47ac1b4abbd2331e5058b9c",
    "signature": "0x83942ec6b09acc73cdeed24e6cc01f7d8a776e04a18d3ee60ab2b9b75b936e3a6d381278f1d279e0de462026af1d050c200f068efdb95bb4bd72ffae51f595bb1c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}