Tineke Postma (born August 31, 1978) is a Dutch jazz saxophonist and composer. Saxophonist and composer Tineke Postma was named a rising star for soprano saxophone in DownBeat’s 2019 critics poll. Sh
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8da4641b6988192f355b6b4e8d43638217470b1908a0ae9b8244d36417bb5231. Chain 2 (Bitcoin): anchored in block 953808 (2026-06-15T16:45:15Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ef9c0752-0645-4614-b1d1-d1cc3af1c039.json and https://artists.proofprofile.net/proofs/artist/ef9c0752-0645-4614-b1d1-d1cc3af1c039.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).