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 0xfad749a4d58f37be3b50ba276a5d0af93f7d7ea3f6dd4e41cd7ab96c90caecf6. 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/e92c3a9b-d29b-47ba-8730-58d14cac6722.json and https://artists.proofprofile.net/proofs/artist/e92c3a9b-d29b-47ba-8730-58d14cac6722.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 0xa460d5221236e323efc9d96637e18a967c665c95be4de4ec46d232a640c64bc4. 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/DED811501220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6452876cc969e51c54da057e13c36ca6af4748f3d37cf76d21da63be1c2cc65. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/DEA621601962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa692c413a40564969c939f1ca0d5cbe5c22ac5b116ba7708b2cf63403d67e995. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/DEA621601963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad928296712ac9e987e6fb268805c6ae4227667efc74f281dde2f0b847702b55. 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/DEA621601967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86f6888b2d4e1ae6f0b5daad5fe36886bf950ca28d4e5e988cd27ec6568158f4. 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/DEA622100299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x717a6b88d7cebd32049e11bfaec8a44b1e549164ab5a915353e599cfad22ca2e. 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/DEA622100298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fb9fc5eedaa1e808af93a3b80735fe28b501f2707ec6e383275fcb8a9d5c02a. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/DEA622201683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53bfbfdac1e956f0b718d67110d302cc9eee8ea0bd5284ac3b8d253e30c7370d. 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/DEA622303301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0a508f6d8de3fe1169e6108808d695a087bc95647df76d9cb1dc3c6cf2e8643. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/IL6191500047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb748f9c82cbcb995485751ac864afb09ce8857dfeefa7ea950c7aa7ba7bda4e. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/IL6191500048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66e49be77ecb51cb9559c99f93086fe7f4e96214a0c4cf88495577c2fde84720. Chain 2 (Bitcoin): anchored in block 960487 (2026-08-01T00:15:43Z), 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/IL6191500049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x385d4a0794f0b7e593f5a2fc87b488f19308d39676a79ef5fa6b9ee3f2239d19. Chain 2 (Bitcoin): anchored in block 960430 (2026-07-31T16:09:41Z), 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/IL6191500052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf31e2b5ebccd1ab2ee93f9f7d185a5ae54dc6b625c5965fd60200fa5d405623b. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/IL6191500054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d1c920f953cc66d73242645f1c71cb6d2ba64e10d93d27df416b548403f5528. 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/IL6191500057.