{
  "manageEntity": {
    "action": "Save",
    "entityId": "470077",
    "entityType": "Track",
    "nonce": "0x4bf3005878800ada1d624f88f8fa19ecec17e5e746fe1253bb5f30c3db3f713b",
    "signature": "0x63ca3d34bf01e5c04deae8627aca34b81951c0ca643e0f614cc49d376af310f55ba3db281901a3d650e37713dc7d2a6f46223589aff7ee4ab61a452a193b97a91c",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}