{
  "manageEntity": {
    "action": "Save",
    "entityId": "1943991027",
    "entityType": "Track",
    "nonce": "0x5d33d3f0847ffa99d6a42f91f925cfcfd77306e1311433b1b06f9e4dc4c72392",
    "signature": "0xef0f376a4788a8ea555561338cb1c1f5559cdfbae014e12492d3f09e17d6cfd93eb318bb1bdd68082ff6671ff83c84726f7494ede389cb25abccc2cb761cc7071c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}