{
  "manageEntity": {
    "action": "Save",
    "entityId": "630744393",
    "entityType": "Track",
    "nonce": "0xa7d99654fe3c733daee3be7db62fd6c1cbe89aaa885c019c01c89abff7e6c089",
    "signature": "0xecedd2ba0b526b1bc1e8f76d212361992525ff67681f3590e8b06785e89b65d21b4b47c4621ffce662a1a7b93b4eb79de59bc816b60a834af160cc2dce3f75291b",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}