{
  "manageEntity": {
    "action": "Save",
    "entityId": "280862745",
    "entityType": "Track",
    "nonce": "0x3004186c1b67ddf823b64ac725e70ef6f6b6d7ae252d0d4101b24defee14fafd",
    "signature": "0x789d537ca35592cd40eab00c290806ae3d45195e4b18a0ad731546b9111a4dd4723df1a6e10e34dd637f0a47375178228d111430745628492294684a6ffcedf91c",
    "signer": "0x849938DF063059EbF6d907f55E72C083347C9343",
    "userId": "796529120"
  }
}