{
  "manageEntity": {
    "action": "Save",
    "entityId": "876811609",
    "entityType": "Track",
    "nonce": "0xd8fb1ae582628621ed96a69e01fb4bbad720bcdba4fa454ba35effff6e960eff",
    "signature": "0xd9ed73505b20dc03d513962b5140166d5fb59a728eed33bbb033196cbb18a48e211900611412f602d3f0e07987e4a8aa4f144e71456ffd316f84497a16775ecc1c",
    "signer": "0x849938DF063059EbF6d907f55E72C083347C9343",
    "userId": "796529120"
  }
}