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 0x1ed5a817753129db246928e16d6e194faa4c7a271b6a6432f1d78afd3089c2e2. 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/77e48347-a772-44d5-8890-8c2f7e2c77ee.json and https://artists.proofprofile.net/proofs/artist/77e48347-a772-44d5-8890-8c2f7e2c77ee.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 0xb93b280760e0bb08fc0f324333ddf62134892f763dfa0d73dd8a85f63a177fe1. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/TR2180610703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde2894ba8c5bf626a9e44fe70dce89e89855bffe9185dc8e5e3d2bff14fb8860. 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/TR2180610704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49ebda70140e94b91bf2fc9bea237ad2d82bfee4431cd6ad95e86235cd8cdd39. 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/TR2180610706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a434e82af047e70686e8b5e37fcd5bd7c1592ca40ee41de6190e8f9a3fe1dff. Chain 2 (Bitcoin): anchored in block 959011 (2026-07-21T13:26:15Z), 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/TR2180610711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2131c4de752632b3e2a91670ddcea85d0d06d5611290f52b67ded95076b1b6dd. Chain 2 (Bitcoin): anchored in block 958889 (2026-07-20T13:24:39Z), 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/TR2180612004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bfb4bfc9d0ad0dcb3f09df428c446509d32646363647dc3008146b1aaaa50c9. Chain 2 (Bitcoin): anchored in block 957638 (2026-07-12T01:56:41Z), 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/TR2180612011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e8935f6e6934a8ee8eb0221ad370a5d13b52dc6ea3ce74d59cc605cce20d467. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/TR2180602901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb681b63d5a6e7b8aa3a27f82b09c8206bbacb77def25611433e3ca75583d0fc. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/TR2180602903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55f7b499574a4a9105e3ab753d846f2a59cdf0fa5a7ac19c31a0911adb6a65ff. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/TR2180602905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b8fb66aac09e7416df208270629dd7297a97c05c712980e72e07f3b8ecdc743. Chain 2 (Bitcoin): anchored in block 959054 (2026-07-21T22:51:24Z), 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/TR2180602913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x795fac76b8a3b57f794da3af6212d3ad88a9f28c49b39857a059bdfd2af9796e. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T20:39:54Z), 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/TR2180804910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed47c89c9bcf8611e562b9754854f4317b82367da34ecb32bb17588d13c0a5f5. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/TR2180804905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x611ba2f1b7d98d43cf8800b9d40864cdc4ddff9bac24ff73a04761fcb663af0f. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/TR2180804901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeeadfe6a7bd167476824301bdf30030bbdc9db87392a7acf21abb2b19f74d1ed. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/TR0651102957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee0a6a0649e0975a6ec66a306cca95fc917c2203226d5859bf3b84cf7ac0019a. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/TR0651102961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17092395a0f3fafa6f77041da22fdc8daa6d324b6e751a106e15945605c0ec30. 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/TR0651102963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc859c7db0cae420416ab9dcc66044d22e5063ea6f95fb30c87c892fe6b7b71c2. Chain 2 (Bitcoin): anchored in block 958677 (2026-07-19T05:47:23Z), 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/TR0151800061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64f6e1bae8dbc261e7333252f98aa705a547fcb9c34cba127bc6973a0e640701. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/TR6932300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f5227ab7c7461e5d1993bf8541a46e065ee2f93f7e85ef2fc29b2479d18bd18. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T08:40:50Z), 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/TR6932400007.