{
  "manageEntity": {
    "action": "Create",
    "entityId": "571540236",
    "entityType": "Track",
    "metadata": "{\"cid\":\"\",\"data\":{\"cover_art_sizes\":\"baeaaaiqsedquyv3bcen3oj26qmpebfuh7jx76h7c2g7jcphknakfriihqwo2i\",\"duration\":260,\"genre\":\"Classical\",\"orig_file_cid\":\"baeaaaiqsedngfqaro7ang4ffkp7vmgs7b6tam34kq7lwjwz3e5ooxjhffcxfm\",\"orig_filename\":\"Mozart's  Sonate KV 311.wav\",\"owner_id\":509651367,\"preview_cid\":\"baeaaaiqsed2hetvusovozhmdbajd6ofcqoz5ce2x45k65jo4bfsk4i3xztfsg\",\"title\":\"Mozart's  Sonate KV 311\",\"track_cid\":\"baeaaaiqseajte3bfg7zkdifh64qsdivrdujx7vxm2fvqwcp4ogh5osi2fd5ck\"}}",
    "nonce": "1787525545633709508",
    "signature": "0x09a1ebed5fdc8ac399f5801004fd0634d01de95c49bf39ed6ad9e56be06dd5f1127dda6a6d45ca74bcb80e7598eeeaf8314957734889a6cd01a0a1bc6404dee71c",
    "signer": "0x8CB448A729Eca339BC72280C850c5479f5Cb0AB5",
    "userId": "509651367"
  }
}