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 0xb232f48366fcdb5921675947493723e730ba3d825311a0cb95717a98af6954b2. 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/324d8580-a207-4b27-b6b5-010c487903fb.json and https://artists.proofprofile.net/proofs/artist/324d8580-a207-4b27-b6b5-010c487903fb.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 0xb501818ae8801a8de8d49d053c1bdf20b11c690507febf6b56e36acade818393. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/DEVF11700206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68052e67c65addb1d88ba1bc655db9bdeb990f2497de6ccc90baa3dafb104986. 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/DEVF11700205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1f0a6e46ee202c4fd999e34a4ce6a2e4d80198fd925335e5ba9f091a016d1df. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QM24S1915491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a2ae68d6ebfb7a047afb86d96d9a9586eecc4431b270055afac342bc34eb606. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/GBCFB2100500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a2ae68d6ebfb7a047afb86d96d9a9586eecc4431b270055afac342bc34eb606. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/GBCFB2100500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8c9c54af31a57b46b55674a0e5dec77a8ef15a2bf42d7b2a12d1251534fa5ef. 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/GBCFB2100560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x813866da5dccb5b854db29515181c4fc297732166b284f2db03f4ce3fe1756e6. 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/GBCFB2200795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x278affcfa84099039effafab3dc437957f19ef27419946e2a4e5932fee943714. Chain 2 (Bitcoin): anchored in block 958571 (2026-07-18T15:39:25Z), 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/GBCFB2200796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb545c81e9a63d015f958c03d16becf7557d59124ab41a0a7c12055cab646c3e. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-17T04:10:28Z), 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/GBCFB2300272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x278affcfa84099039effafab3dc437957f19ef27419946e2a4e5932fee943714. Chain 2 (Bitcoin): anchored in block 958495 (2026-07-18T04:39:02Z), 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/GBCFB2200796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5b714af1de6bfef7e4c13d5eaedfba742a4321a4d9a2e2caa8a1453a81127b8. 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/GBCFB2300270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa315373775b6bb1de6b4b8f22a5c9c60b0bbf5ee30fede01ed23115fbb7c3ada. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/GBCFB2300271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8296ebb2929a34cefcc7260dcc3740d7b8f50b394cff4a496391e53d9ef0e12. 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/GBCFB2200980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac94eed8da89f611f40940d8fe82a813cd7a8f3cc1fbc9a486961a0679c45520. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NZDY11800027.