{
  "manageEntity": {
    "action": "Save",
    "entityId": "1421072905",
    "entityType": "Track",
    "nonce": "0x5100e928eefb9928fb4e4de398e1e0765cbb169d65fd0d9849fe2ddc97208268",
    "signature": "0xeb29c62c45ad322347bc1e97154d9d34bd6efaa07d038759d62abec9c530be2560c5269df95828166db5c5ea239481193aa3a9d5f9695c64eca188611e5bcfd81c",
    "signer": "0xC35123bF05ca0B3A7B333c53E47bcd9f9DA864d4",
    "userId": "33896318"
  }
}