{
  "manageEntity": {
    "action": "Save",
    "entityId": "311118875",
    "entityType": "Track",
    "nonce": "0x67ad2bffc1af1d4457742e65af49c32c71969002739461a68753da4047f2e2a6",
    "signature": "0xf603f1c31dbb20c951ff4f4f7ee938974477cb29b93e615633387bd830dcbf72021b561fc1483eb8f4162c4ec5fe93e5d91b139e8a9cf038fc163fff6f32037b1c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}