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 0x990fa31ee7cb9d4c428f36e7349b68e3f6200b9fc1a24a9fa4337bdfed44f8a7. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e6799f73-35f9-41ff-8b3e-47a93a332ba4.json and https://artists.proofprofile.net/proofs/artist/e6799f73-35f9-41ff-8b3e-47a93a332ba4.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 0xe93db8bc227e1a9eb89235bf4d95c3f0f1ec1c9e8e2222230c7499670eb36298. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZFZ22046567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe93db8bc227e1a9eb89235bf4d95c3f0f1ec1c9e8e2222230c7499670eb36298. 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/QZFZ22046567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef7889bb1dc2cf08e405bf2283691e8b81faef062d09eb0955438419d21d1d19. 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/QZK6J2374990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65ed78da2ed4481b7299f5d11baf574112a775d1a0b2cd59dddacb2b1eed9075. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZHN72326770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a9e1ea1e1f4f49f475df0e681609e851b3c9fddbbdf341ea049fd9dd85da512. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/QZNWW2313324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x762d10c0144cb6e7dd801017498235e2957c33cce8e07fd2ae3b1eeaff8471aa. 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/QZDA72333476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x911eec598166dce95ac236819e7fefa08e4eb35b68b9a5bd07bdd0c6675a8c4b. 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/QZDA72364273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x350bff2a0110471dc08d20548d3e579887965d49848fb523d8ec04c435d4b629. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/QZES92391430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fccf853cdf14638d254edf462d161e05a6197927f953855edea7d9c35290a8a. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZPLR2333968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2cf81eb571714223533a0d83325d69266e16f7afbc3cc99fbd6a0df5add9e19. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/QZMEM2291220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacd1087b5bb321bc82ca963e3590956be19679975115a2c477a715faa8713d23. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/QZNWZ2019323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0c7a98127907814eb99e5e690d5eb148f39fc34924df1a143a71065a36ee5bb. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZFZ42016164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8aab793b6f742eeaf557e79da1327a2d1f8d8acb5558d43acb1cb74154ec91fe. Chain 2 (Bitcoin): anchored in block 957771 (2026-07-12T23:27:28Z), 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/ES34S2500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe76891be08b974e91004a345ef59779b136cf209a0e171a949abbe0f41297f6b. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/ES34S2500007.