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 0x09ac05a6814c2b5a9e8f247443256950be04c39e42e5fcf58259e20aa7005080. 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/948003c5-5d4e-4831-9515-6c84a51a12c2.json and https://artists.proofprofile.net/proofs/artist/948003c5-5d4e-4831-9515-6c84a51a12c2.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 0xb43ac25d182914af25b0c63180ec21037591a8c338e888864860824203af6362. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-22T00:29:17Z), 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/FR2X41465072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf15b8a2a8ad90f81e5d82162989f004ec275c64aa3724fb4a8dd774b7870862d. 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/FR2X41465078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9fc929498ec292d0a226dffbfe37d9e1c9f6cfb900fff30c7d1e778f18d5109. Chain 2 (Bitcoin): anchored in block 957663 (2026-07-12T05:58:46Z), 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/TR0380605036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6faf61d78f666efb4b3216fb84de72439a742122bf109a0a6433c346d2e731f. 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/FR2X41462219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf755266603d147c5f10f75e08df6eb72c67497c71472bd400cddd95242ac60c. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T21:28:17Z), 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/FR2X41462222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fa36dbf80d62b39c02db5fc09f3401ed103ef6fe0b7f4a095062d7a94bb98ed. 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/FR2X41465160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d346e19d09afb5fb20aafa43556be1958730b94be632409330e352b79ab574d. 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/FR2X41465166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7492519b0fb033d32651f2489d90bbc457f62ee83c49b678a28350a087418a1e. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T17:52:36Z), 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/TR2321000413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe99681e9449100325e635ffd21fcc36836ba41702c95b91f119b1aab2c2ae073. 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/TR0030500305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea653dae47fc470a8812b2e09bf09a97d8c6b9553b4c760772e586286dc2de3f. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/TR0431102053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x001c616bdf3501cd5e1a74b0e511bed02a5cbf4e0663cf84c7920db859bdd013. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/TR0432304557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dc298cc0c5f17ae124c56c78a8b599417e047b39551c0c26925fec4318d7667. Chain 2 (Bitcoin): anchored in block 957668 (2026-07-12T06:54:37Z), 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/QMFMF2465543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x918f741280234580aa69601484700018d7c9a753bc963d513005e85832a22bcb. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QMFMF2465544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3502c198acd796457a161e1bc4d0667e511b1e65cfafe1becd6e11f19c54315d. 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/TRART1700029.