{
  "manageEntity": {
    "action": "Save",
    "entityId": "990169799",
    "entityType": "Track",
    "nonce": "0xf02cae676da9bb0e6fa7479305b7fa5c2b63165cbdcb14a8be062bfcda07e3c7",
    "signature": "0x7e8fd125151012ed70b5d29c249fc6a441448475c1976cb053db983318ea18d33e7c39e40a3be32b59ef31ce48bd168844f20f88239c76edc51b4d4c9143f66c1b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}