{
  "manageEntity": {
    "action": "Save",
    "entityId": "1518688960",
    "entityType": "Track",
    "nonce": "0x3b1ae209677d1e3adada0e6da596601d857af683d5f7940a352799ec1492beeb",
    "signature": "0x6cd4a7a426ee3303500e1b79f352e140452b49f2017c32887901a0466b24bcf31727ab6b7b59d39328021bd67e4a875a09051fa1ee1164b380f9b98c1e31ff051c",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}