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 0x2d91657ac54e8d3ab570543d7951297c4eab6fb43d1e2aeb3341dd130cc50b80. 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/6d14d83c-b694-4b84-aad4-bdabb6d4d891.json and https://artists.proofprofile.net/proofs/artist/6d14d83c-b694-4b84-aad4-bdabb6d4d891.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 0xb4367eaf826ffbf0fe523336798e941986b0b07f98ffe60b4ef21c83541b4b23. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/FRX452534188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabd3649fa9f9483a3d1fce3583bc16953b24efa15c3ce069a8bbdae07f65c7db. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/FRX282208825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ff370cc1aa9d100df1944ba9db658347ad5e2bcce0ccb42e7864b3371b67d34. 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/FRX282208826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1638e8da2e2b22ae8a843196cdc981e9a58c3689b9011df7ac0a4de43eb5c607. 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/FRX282208827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21a1f2d7cd64e50ff1dba3a115cfdaa3aca531028e227ca8c00ad3419201dc36. 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/FRX762506479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57c6fedcdaefe542e8e2da4c41f657b7ca15fcd489811c2616d8617dd3bc10ea. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/FRX762506486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd284a06cf6d44a477ad5051886b34a6efe2d65932b3805ed2106c570f85b00a1. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/TCAFA2013920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf15eb6f889bbe3c9a38adeacfb8673fb04bf7bd5d9308ec6b883b3315268cb29. 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/TCAFA2013923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3928e4c68ca5dd62a1d407be5849161525e05608386f4cafd6e7db161f98017d. Chain 2 (Bitcoin): anchored in block 957638 (2026-07-12T01:56:41Z), 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/TCAFA2013926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a69a2f36b4ee3da6f75605887a2324f8fe71df7d5a53aa3d51e8b721f1f85fe. 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/TCAFA2013929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x428b68853de0daa6cfb96e25cb91bc58319df50e37cb8f9c1202ac7db159d212. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/TCAFA2013930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b77518883a551da5123acd32b98166f0b2e55d38135ae8e97e18c0366c853e3. Chain 2 (Bitcoin): anchored in block 958680 (2026-07-19T06:04:14Z), 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/TCAFA2014107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0235b28da84647e06d29d7ee4a12726fc17a49b6df2eed5999bbb309e3967ffa. Chain 2 (Bitcoin): anchored in block 958342 (2026-07-17T01:09:53Z), 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/TCAFA2014109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88f60117722a1cc3c52c3d3c6de244c30d1413a37fe55edcf60e8239c1055607. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/TCAFA2014118.