{
  "manageEntity": {
    "action": "Save",
    "entityId": "618146",
    "entityType": "Track",
    "nonce": "0xe2d08beef045e1541e77103cee28f29f62d34cc4f02acc2f254b4f90568acfec",
    "signature": "0xdc77ff3684cf7afa952abfd77b8d01719a9c613b1bcb248c5a6963b9e2755a266c4def58a74f6d370aede1b877d138d2fb0165bd3a9a484e1c0c0b294d68bbc21c",
    "signer": "0x8Faf02F9fA75C0731cF6651A50548F44335cc832",
    "userId": "176881148"
  }
}