Steel Hammer is a 2009 composition for three sopranos and chamber ensemble by the American composer Julia Wolfe. It was first performed on November 21, 2009, at Zankel Hall by the contemporary classi
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 0x2495835598b7bb660d3a62ff564794b2f221c6dbdcc3ec3a2fdf44122ae9e990. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8b8980ea-4250-4c21-bebe-19739a5eec37.json and https://artists.proofprofile.net/proofs/artist/8b8980ea-4250-4c21-bebe-19739a5eec37.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).