{
  "manageEntity": {
    "action": "Save",
    "entityId": "47641629",
    "entityType": "Track",
    "nonce": "0x2cdcdb4f717d60bce899335c08b2cc5335e48372fc809d51eb5fc61199b0dda2",
    "signature": "0x580c4dc07eff257e436d9537480fcda3bed004116573e8bf0e4f9ec74257545166edcf94acc957837a050a648a0db0a84f55933b07005d98991e3f326d55a4781c",
    "signer": "0xbf1f8021D15fDffe83FE44dA0b0c9CE22371359e",
    "userId": "276678878"
  }
}