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 0x7e993bd2593e65bd8d5171c6e44eac37a0496154e2d91dcd39d526834e53ec87. Chain 2 (Bitcoin): anchored in block 953596 (2026-06-14T06:21:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/08e2d5a8-6077-4c2e-93dd-75471cbd31bc.json and https://artists.proofprofile.net/proofs/artist/08e2d5a8-6077-4c2e-93dd-75471cbd31bc.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 0x382646061481fd4e637d281f0e51e1cfcfa90d1c615a3f91f2cb65d193d3322a. 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/QZFZ42378563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe04d4ec15197d5a7c1b84e6c1a3514c2d9b277ab3cf5d886eeaee6a45a1fe95. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/DEH742412383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21d27ef3f290480bcfbd6dfdb21c7ea6d27dd63948a64f63521e837c15cecb7e. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/DEH742412384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8817c3ad4e5530b1c04a0312b218ef9a97338684fac314e001802f1f91dce166. 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/DEH742404428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x113885a71041583a20d085b5f6fa9a1ba2f873b7d1f78b691d936884b36aa783. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/DEH742412385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7fce21503b11a1c8f0f8bb56905ee260c85ecae5adabac81d076d99236a35d0. 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/DEH742404538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9febdbb0357339b4efde472d78593cc5d3016de90fefed30ea5cebf3ce8e262c. 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/DEH742412386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e14941567fb4b738f7b827290a9912f2fa338322d2dee91b38e07ec06415023. 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/DEH742412387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd22a829341f4bfd627a568a9bc1d819193197d1e59d7f7834f681d754926e228. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/DEH742412388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xced9f6e8fbf2691dfb84fa9d30916f94fa7be1eaa3875559cf3154d4f0b48eca. 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/DEH742406475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa23517fa475349d3036b32cb2fc29ae2dc0b20b4c538dea7e267c679ffcde4a8. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/US23A1589765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c08498108a9434e4604b604824f9f70f8872cfad161b4ceabca07928c03b18d. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/GBTVQ2500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26854f7cc5f647116ecd4aedb3ad38224907fdacfd222758375ad761865da8db. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/GBTVQ2500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x628b4bf4ac41bfc9f9b9a19aa7a97d477c87c0f46bdd1a5b73aceef17b34a4c7. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), 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/GBTVQ2500016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac327f58968c3d48d2c9c006b185b43c4b2210bcb73653a9d73da97f65f5b56d. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/GBTVQ2500015.