{
  "manageEntity": {
    "action": "Save",
    "entityId": "523931345",
    "entityType": "Track",
    "nonce": "0xffafd4fe8058dad752d21f61c14e2cb462627db367c14bf1f01d76da2e6e7a19",
    "signature": "0xedadf56b9ed08c14e8cf5306a41dd0bfef25e6425d6e05471cdd2d2b4869d0eb2ded1550219f62a22d88ad8915e6746cf65d7438011f07da10f6ae9e7bf510761b",
    "signer": "0x796D60E9fE921C82Ef20f6329e27dD246392f542",
    "userId": "809803"
  }
}