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 0x3471dc8aa20be22f9ebc4828404471f694ea85fe90d9e0bd3e685de6a29361b8. Chain 2 (Bitcoin): anchored in block 953758 (2026-06-15T07:48:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b2bd9ebd-b64a-4be5-addd-72cd8046feea.json and https://artists.proofprofile.net/proofs/artist/b2bd9ebd-b64a-4be5-addd-72cd8046feea.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 0xdc70a34c342be3b33990e7fbfbafd2fad05036a4113387f559fb93b525baf3b1. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DGA062039287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f10e83e4c85d34d3f3bbb669f9ba65362fd4b510b777eaad7d33c124bc953f5. 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/DGA062039288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5148f66e0623484e62db6e5e6788d74b8ce823242dbb122b11f35973d9bd8cc. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QM6P41834545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bc0699a227e119964a85ebb9e846843b7f50434eec0a354b378a7bda9ee2bc9. Chain 2 (Bitcoin): anchored in block 959091 (2026-07-22T02:33:54Z), 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/NLM791910007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9220e5bc55c2a1d9c0c29d4651b4244f46456a2adc0f173563726a7b3ee4b6e9. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/USYBL2101463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf06e14b200c5566fcc72861b198ce01695d1ff67067cc1a96ca60455b1f43f3c. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/USYBL2101465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd6c914c851c0c37d2e75848d31888e8ac95a26571c4577fa3b419bc1ab0f7e9. 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/USYBL2101466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ea681722edd2c65a8642688f5a9272fddd885f835f7a08107a86a065296ac43. 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/USYBL2101468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bab69b364f76236349c0305f3aefd430cf30316d8d05a327324a99ee3597c10. 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/USYBL2101471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc21607b10e09b68e7cafdd05d9935bac0ee86ad5c1d4cae4231bc43d44192a8. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/USYBL2101475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cce00de1fb5b6504879659ea6f11c5fd815567d96cf4f5b9fc0a9cc4a52c9cd. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/UKDMZ2500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc79f47b2366e5d5e8949f5c259498a18ea1ec5d43988ba066d8c2456361956b. 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/NLL562503362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc79f47b2366e5d5e8949f5c259498a18ea1ec5d43988ba066d8c2456361956b. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/NLL562503362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0393a2515b74fcefaab74d8487c120054c80c47fbdb0cd51ab1d327db8358f00. 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/NLL562503363.