{
  "manageEntity": {
    "action": "Save",
    "entityId": "297540",
    "entityType": "Track",
    "nonce": "0x6aeffbf2f7ae182fef5459b0676122374530b330fabbaa305c7ed5bf983e2d6d",
    "signature": "0x73edcad205c21352141d8c26c1e40e6bdfcf5d3eaff162325b04e74fef7f27cf7cb851153b63952a5d68a9c5475cdf6e5b1a75e54d10b68dc0940a1dd6da4d491b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}