{
  "manageEntity": {
    "action": "Save",
    "entityId": "385386774",
    "entityType": "Track",
    "nonce": "0xea1e30fabb9d4d3b50a5ac6061ead7d1dc812fcd95f29029162303ffbbed6e17",
    "signature": "0xd88048336855113ecd0a2926237bb0d26450b8b429775c4277c0225e26b5082259a9a7a779dff9016a894f94527986063efc9f233e3c545ff97eef022f39c44a1c",
    "signer": "0xDD3Cb841c7f19ec5581F8E2b14d6f7a58B92d0F7",
    "userId": "582464754"
  }
}