{
  "manageEntity": {
    "action": "Save",
    "entityId": "1122528972",
    "entityType": "Track",
    "nonce": "0xa7297385a51f565a0db5f10c97ec45fa836e4da47cbbc9ff6363961b119f2a88",
    "signature": "0xfb3be94b82368c66c8d7fd90ae4320826e7799e28df66d3a343cd4d0f91e31102ade6eb970905ef85cc7f30a3c0d00628b67413c82f1b6c82d500ff749bab1741c",
    "signer": "0xc97A6025Ad8c7Ba1a35Ef7E3A3b88ABc8b2013BF",
    "userId": "666092734"
  }
}