{
  "manageEntity": {
    "action": "Save",
    "entityId": "395517135",
    "entityType": "Track",
    "nonce": "0x2961526e8d3f1c317d7406d51698736f60df07118268271d7ed0a70380e93fd0",
    "signature": "0x55486ca9c6860a569399d669c437c278a9359d80e7040608fc9429c0d19743a0674fad7916028c9d7f61c41409d7cc5fa6e2e58106e3fc8df57b2546046cef1e1b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}