{
  "manageEntity": {
    "action": "Save",
    "entityId": "1900768940",
    "entityType": "Track",
    "nonce": "0x09e4f54e2cbe46fba2b9430a807a70cb8d51357975f866a2135d3c5d939516ec",
    "signature": "0x6d6dede4b7cb284909b843f8f0dac73f5791f5083cc2b6e53490a4fa8c0fa6894c58778b3a2d3e71a46af03070aa0b06daf973a91a22b59599e6e7f112e52f011c",
    "signer": "0x849938DF063059EbF6d907f55E72C083347C9343",
    "userId": "796529120"
  }
}