{
  "manageEntity": {
    "action": "Save",
    "entityId": "139394",
    "entityType": "Track",
    "nonce": "0x682f4619cdd059199e56e1561e7fe40261534e46ce85837f0992795a663e6269",
    "signature": "0x08f3dd2b8f472b81aec3344d30d0567db630cef215b903cfcb1831166121f59c5aa76e46cb8b462a69444bf88676be530da3f25e1b78ec2e2472dc3ff7d45ea11b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}