{
  "manageEntity": {
    "action": "Save",
    "entityId": "744509687",
    "entityType": "Track",
    "nonce": "0x31caa004676e9fdf6e076ccc738ae4ad0e7ea9ec1f03b4beb8b646d3a116f4a1",
    "signature": "0x741e1d14d8906ca4298c6c6ec4132448b16f1c0a8ffe9770e5c014ac49799e0c46d9eccd9ac055eb7429c2021796ad5f8048780bbcdd59475310d7aafab462801c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}