{
  "manageEntity": {
    "action": "Save",
    "entityId": "345433",
    "entityType": "Track",
    "nonce": "0x9bba6cd1d816870c5e80767eab321aff039f3fae6ac73bfea521569588314a21",
    "signature": "0xc8f70c1f1e593210e815b574a28ae91e12e61bea1939703bc35e4458eb92cbba114bf75ff45ac822ed88b06ab8c198213cfadc9e4438702bcf2101bfacda908b1c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}