thumb|upright=0.55|Swiss longsword, 15th or 16th century A sword is an edged, bladed weapon intended for manual cutting or thrusting. Its blade, longer than that of a knife or dagger, is attached to
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 0xf7d3ebf8085f413274c74c54235cf9748c6060b4f5437e0674c4802a93709fdf. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f34d2c37-8bd8-4390-8876-3e960f798656.json and https://artists.proofprofile.net/proofs/artist/f34d2c37-8bd8-4390-8876-3e960f798656.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8b5a52779e921b4f2c27c4d2de6bfa8209c9a9b913ff0fda1cd807fdb7cd89e. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAU118806772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7af58c4e186c953cc2c2833ba46e4436721ef58e8c8370ac05bcf74ae8b3c6ba. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAU118806775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x690af0015d901601de4f686c4daff10e0ace4fdca7495b111b6ecdcc0a1e32bc. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAU118814237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa15c3296292aace21dbfdab1e17b0c1e118ccda338517f336ce0b7286786548f. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAU118814238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3a995bdb557281e7d859db96be5d98307771bcfa5b45da23da9954e908be86f. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T08:10:05Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DER372225701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d02fb30b9150325bb13fbcd6021ead1d87b18b8ed28caae239a0542cf7e555b. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DER372225703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7faa873a36b7d754a8d4c472771df4c92216d4cfbc31694db73a8c56fca7965. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DER372225706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53870eaded5fac659541ec2b09c34a742270c571d774bb9d057dd4f81bb3c85b. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T21:43:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DER372225707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69b362c563bf1a2cb4f00a4a5b47dddd635b67f84b891e3c49232f918e47d491. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GX8LE2525101.