{
  "manageEntity": {
    "action": "Save",
    "entityId": "1549057913",
    "entityType": "Track",
    "nonce": "0x8c0c7ef913062065115ae859869d245f41451dbea5257564accc25eec0501d56",
    "signature": "0x13fcf3805dc1d98ae4c3af1047faf633484278aec83fa5046bdda85d1e25315e190af2c7adbb3b354a5908ed4ea76416269ca9d234b1d452db394088607ba2511c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}