{
  "manageEntity": {
    "action": "Save",
    "entityId": "121313",
    "entityType": "Track",
    "nonce": "0xa14b118b9277d86070b061b08bfed9cf0f382909d1ad391f4e100e894875a787",
    "signature": "0x4c11c7b3e667b15ec623541b2709b4c55104ebdeacb769a415ba0a77683a25f0338a724f2d265cd923324a00a9fba1848a538b5ad35ce8402746a19ca8c82ab11b",
    "signer": "0x15B9643abE09bd37C52a5BD1dCF938B05b06cBFB",
    "userId": "370091516"
  }
}