{
  "manageEntity": {
    "action": "Save",
    "entityId": "1573385945",
    "entityType": "Track",
    "nonce": "0xc38f57ee30449c9adfe02b3715f241fd67e466b5be7c777c97139af406a52408",
    "signature": "0x82d40c5b0035c88c2d85b926263ba83a2f05430e6ad128eb5fec0e33a6bf106b55a2f03f6e76953d5ee22677d239d83670a2c79fe892857c4f8ad794a7bc886f1c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}