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 0x3b21d4760358450fe91c15c1e9ceadaae7fc0cdd0c9af243f26ac408c4951b92. 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/30cc27c1-4715-4d63-b437-48c2e5e95399.json and https://artists.proofprofile.net/proofs/artist/30cc27c1-4715-4d63-b437-48c2e5e95399.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 0x72a27663c4264bedb5f4203da31bebe985dbfbbfc4937520bfab6ad6be4d5bde. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/CANSI2000008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x596c18273fd99af2ca478ca9e680383ea3ce6df9a00fca447073bd20a5048438. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/CANSI2000009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa86d00959b4b36bfdcb3e48f041082fb509cc47dacb30b84320a096f6a28634b. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/CANSI2000013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x919fa3c888c147c3c4e89445e564d86d52a1008e7058d3008bf93581f2e10061. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/CANSI2000014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ce212710c191c6760957ae22abfa80f9419df1dcb43852a151da76e0bb0ea36. 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/CANSI2000015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90948baff2a30f263bceed8c25109c0d998d7d95656eeba7c928af21ab6677ee. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/CANSI2000018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x588f2600324b140640de85569cde10e9da791436e8005360d3cd3869728a1bf3. 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/CANSI2000020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x935e8c4f505217a5c95516ab01052cee7626b8497cdf0421807af20e3ed87993. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/CANSI2000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14be03773926cc8f1cb2dd44c3407f3451cbf51c32e9da37f69ea17344b54fb4. 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/CANSI2000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51798c4b878a061a31ed58bbd90acef893b57c4f070fcdb12bd850adb6b4644a. 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/CANSI2000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa843078b1ca617236664543f9f72a1b72d7600c2e92f854d3370e088c0a892d. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/CANSI2000006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99d414af2c1b8d969f1e6b985052107dc7fdffb5ef8dde8e6be95038fef0cabb. 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/CANSI2000023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3a28b202e9374a6eeb8502ccf3e07a29309807f9ab4629130d9810f312187d1. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/CA6AG2200022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4cf10325ebd4efd8c406cb758b55af60b539a5288cc2acaf64bce4c28dcc81a. 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/CAK722389203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb27a2e01fea3a6824abdedec67454d5329b3159fc665d169186864a7b17355f. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/CAQ522275001.