{
  "manageEntity": {
    "action": "Save",
    "entityId": "2129217440",
    "entityType": "Track",
    "nonce": "0x19da1fbb2b49fc34d34ef25ba49be33e70e57a41d9a1792155a5105e8eae94c5",
    "signature": "0x4f9929aaf141952434748423321089d595d7c0fd9db872a4b0dc66b52ae52a07469d86b9c02fa192fbbc483f65e78d935299b9b7602f82a471b847e7f1b074fe1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}