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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83bc06809b8dbe5d914ded84d68bb4edff0ae844058803e5f1c92fa1f365dd2a. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/866076c6-63d4-4edd-8297-afd4517c98b5.json and https://artists.proofprofile.net/proofs/artist/866076c6-63d4-4edd-8297-afd4517c98b5.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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25d01338e2b003a3c38e9a13c30754ec6951e75b2e98f583beb0504ca310deb3. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QM24S2406626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb89f05c852dbbc24fcf69cf36a3ff0f9dc3c335ba9a92f4ea17119831a602d73. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QM24S2406625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dbec1b053a4b5b3e5223a47cb8ae7626de5361019c94c4e599fd2d16cf5f912. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USXQS2439615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64ef80b374b1461aa6f48084b978afe194327b97607969f5fbe079a607823420. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USXQS2439616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf819aaab4ad4926b863def56090a837107d4061a3ab1188717994db2f9a394b6. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/USXQS2439618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe95ab83a0471d0ab2c36c64810fe7e01cc6d24acda940f72e72cf53fb5820c3d. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USXQS2439619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4f897d8d0e9bb846037e8ef4606794965a8601b6e382defb0d46e9afa1c8646. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USXQS2439620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc74ae318b5e1f11b2ec0380aaf537232146eb5135990bfe01b8e896757ecfb6d. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USXQS2439621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ac58a87581fa8b2bad0c3a9b371005bd8b912fe4b1439e4a211f2d103a0d7c9. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USXQS2439622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62d3e5f12c077ad4fe94abf5535dcc325fb7f4061d80f493d64ed95913c35c6f. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USXQS2439623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4277a55a8c27678947b945a1d6ee9a3dd04e1554434e776293e78b23332b5361. Chain 2 (Bitcoin): anchored in block 960179 (2026-07-30T00:39:11Z), 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/USXQS2439625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59f434e448492bf92ebc22c0a8b4ac36c27d6e48564e62c2e0e5aa8be97a0d06. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/USXQS2439627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43ad0548f4b1abfea9c9dd75d695eff4f1ad84585b09d6ad29551b7dcd4c3dde. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/USXQS2439628.