{
  "manageEntity": {
    "action": "Save",
    "entityId": "186553632",
    "entityType": "Track",
    "nonce": "0x387238c9070af5c94d8f972025100ba6bde67baa044cf66c0af86ea780299ada",
    "signature": "0xa6013c7c90879057712583de4317df299b60328f03c9e34b2e6d7e54cbe876744dfefa812e92d2dbec3eb4d816c3ad7efc51f1aead42fde69a11918ccfd04c141b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}