{
  "manageEntity": {
    "action": "Save",
    "entityId": "499441481",
    "entityType": "Track",
    "nonce": "0xab09a749e4738d6c924c20a101ee819e68bf4379a4c4e01a256124092cc99dcc",
    "signature": "0xa010ad60a465254df9204829f8c542287ea98d46514e01cda46cb58cc7aca9911df6418aed0f97958444c12be3fe2ab6ba69d9531022367a7b46eb1755afe85a1c",
    "signer": "0x6778772C8bEAc9AaE0A4a7faE307a5C48fE9245e",
    "userId": "548409021"
  }
}