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 0x9db6e3d9683a9046d4e333dd6b47f882b211f808d2b17583599a3b30d34839bf. 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/0de035f1-2d2c-4b6d-a81e-a3555ee97976.json and https://artists.proofprofile.net/proofs/artist/0de035f1-2d2c-4b6d-a81e-a3555ee97976.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 0x3720ba1d6e79c8563dc7327ffb66e39e1ab1f88d75ba05f79af64330ff626b8b. 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/PT8HL1800002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dae3542b691d1ffdec5db4dddd42c745b0821b27e379faf62adce540b37d054. Chain 2 (Bitcoin): anchored in block 957868 (2026-07-13T14:56:55Z), 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/PT8HL1800006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x105b38a695d1f04204de46b8cec106a99f1e9ca1151f0d7f022a57dc6c8aa9da. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/PT8HL1900011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ec863e1f7af4529b997b3de679cbff824415beeaa75dcf397db4ab4208cb0ee. 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/PT8HL1900012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x457f048cf2ff948316f4e5ceecce7f6f1a7de17697d0c0366d73f4ec2a7189c8. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/PTBM11900172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x223b549946e1321070fac7e7f8a9989799c26f310c5ee76cb503cc5e1bc56881. 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/PT8HL1900013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x063499d0832f0b9ffe033e81b13151ff0efc66f04fbba0e25b3b719ec1f4d3f2. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/PT8HL1900014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a1c0146cd6ae1fe80b1dd6de87f39be99bd7e439d6790614a0955134802bf82. 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/PT8HL1900007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1b97c2a8e796721bf692f26491a17bcd1c5551db1581f6ce3396e71e1e48a94. 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/PT8HL1900015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ce2b3f09eed06e69cd24fb6c72b6d8e868a261f47b1d047a0bf341e5e40fcbf. 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/PT8HL1900016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4741c0c6ab728b16887cea2a747f4ec3cb00a9bb35904522879b70a2d21d8c6. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/PT8HL1900018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x826ade9cf1a7236a05a1249a350dc6b5ee533c6241eeeb3e621f63c703520d43. 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/PT8HL1900019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5c6633a58af3efb66cfcc660f45a374f723a1afba1957072904fb4f6646d372. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/PT8HL1900020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22f34f63109e53674ffe5784921959e32a959200faff8bd62da7ea012088625f. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/PT8HL1900021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bf42a9cc315bb3f54c7b902754aceff4a7255677cd58bb814590f21b9bbc3f3. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/TCAJB2468303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1fdc477189057274484ec4dbe11682336df078442c62bac594ca617377800a6. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/PT2HE1800001.