{
  "manageEntity": {
    "action": "Save",
    "entityId": "305780159",
    "entityType": "Track",
    "nonce": "0xa707120510569289084bfb4a0a7570471f15aeb93578ba87b7edd827e8bee277",
    "signature": "0x49e0d7e206dffa0240cb5a7c68fd5015d38abab63c208358756bbd3e5a59a54463f1653b9e28e88c61e3847ea8fcfa6d45ffbbcfd2f6f1a153cda92a03c3a2301c",
    "signer": "0x27204C77Baa4a510c92A96A4ba3661CC53EE568E",
    "userId": "35918963"
  }
}