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 0xce963673996901472cdb03fa4c3e7b3bbaf8811479eac7d358e79b25cb18a1c8. Chain 2 (Bitcoin): anchored in block 953713 (2026-06-15T00:33:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/80e86105-2d5f-47bf-b011-4c7ff1c48ab2.json and https://artists.proofprofile.net/proofs/artist/80e86105-2d5f-47bf-b011-4c7ff1c48ab2.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 0x5c3cad42c6a22b6296fb9ceeee44d2806111d57ab34cc31db11c747ee785e467. Chain 2 (Bitcoin): anchored in block 960387 (2026-07-31T10:06:30Z), 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/NL1JE2200007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42912eca838876f12e575145f3cd226d53287af3992ded988377bc9a9a1eaaff. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/NL1JE2200008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00c6bea1aaf8e1dde176b1f8a2fc93e958c547844aface9ffe181eb689c5a44b. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/GBLLT2402731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5df27bf24ee6be5269c4c9cb41e96a49d5dd083e6dea3d11a0071cd05c533984. 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/GBLLT2402732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbad66b71662780a510e6215b1e01302a520ced73cf21305fe7048afa03b9a4f4. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/GBLLT2329711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2b1870ce347bd3f18726c6c8be1390d87bf883531e234c1a9f6e1d0aa65fa35. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/GBLLT2328815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1c5c3f2d4f4819229898a9c55b6ea0c9711184b7af8ed4e5a78d6754ffa97df. 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/NL1JE2300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e876ab6dc058e3c033229d3fad4fec944aeb9cbbe04ba68cd86064ec94ecb0a. 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/NL1JE2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbd27a475fd7878a80ae41c68602c68ff94ac0292c20973080b913a57375db39. 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/NL1JE2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7aca36fa0fa3753e6aba25d9a49633f82e3044b26ee034ad67e5662d1a6cc0f2. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/NL1JE2100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14b26be4a1ea8628117c12c63698a7f5ce384ab5893b1283bfd5b75bfc8fb62f. 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/NL1JE2000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c5adefd1dcbc4d843107cb4e78ed51154c2b3677ad9f6e2c57db8d1118aeb9b. 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/NL1JE1900002.