{
  "manageEntity": {
    "action": "Save",
    "entityId": "1075830",
    "entityType": "Track",
    "nonce": "0xe44c6adcad6e187d7125ecef14a9d9cf0d52fd304070c3cfc3c391a0f343c283",
    "signature": "0xa098dd297441c71b8496ea94eac94322555a4ecee515729f20bd1922115ca2763f5ea5139e94e26233dd7fd737c7577353a777a81411752a9a3204139e97029d1c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}