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 0x0345c9533134297d84ecda13aa36640e06aa282f5a91cbade46d0b4983484dad. 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/af96909f-1fe0-4b8b-9293-abf2554c762b.json and https://artists.proofprofile.net/proofs/artist/af96909f-1fe0-4b8b-9293-abf2554c762b.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 0x00f2a7e078d5f888993dbaa6bc507c74d8d5d2df892b2fa6e9270b85bba886be. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/BXCR72500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba6f02d2b8db9ad42d52ef92f84d39567c805a023098a010fbb9be4e06983430. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/BXCR72500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac56d2244a23d2e0a1b57ed30409e1c4f08a2b0dc40f4f5578f2267f26ec1f98. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/BXCR72500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8effeca4ba17bb15a871b14568eaf6d94e9a55f6df9390e2cb6eeb04709731b6. Chain 2 (Bitcoin): anchored in block 958474 (2026-07-18T00:59:09Z), 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/BXCR72500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01f28f7f1983aaea7b0660bae4abf2862a55f1a8c15926f4cee245b11d0209e9. 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/BXCR72500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37a21a8d9e2cba0c6816414d7c124bd6181f0402a558b66a388053e28e9a9127. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/BXCR72500006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x275c41278c519460cb5b96921de4877f798ffe011bbbae98225c454004ea7cd4. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/BXCR72500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9a34104b9ba9a15f0cbb6539e17d6e5b8f1330fb5e1562c77c7a81f63cb3fbe. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/BXCR72500008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0d05128598dba8cc5640009628575f2e19701ba643eefa2b192993e058bc109. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/BXCR72500009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2f9988ff8699ec80b23681d332b4a11a4fbdab988aa66d3db50c1a81e8d1448. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/BXCR72500013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4743ccf12800ee4725ee8f3ea51ac35cf2ba1248ca7bbc04ac36aaed4f6211f9. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/BXCR72500010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c8d4fbf5b58e401f1035ce9be35eaa0c60ea3b749cdde3e67bf6c220fc84e30. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/BXCR72500011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44732e59e9997413a689425d017c120617b31a853418208a5d0a31bf360dd00a. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/BXCR72500012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba6f02d2b8db9ad42d52ef92f84d39567c805a023098a010fbb9be4e06983430. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/BXCR72500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdb113cbc684d9616912ca14301978979c4f811ba4a869041f44b7f64667c4da. 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/QZGLM2405180.