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 0x6371ebad4ae5aba0fbe6cb9e9da954a195fa10b7acc65dda191f7a8b4b21a8f4. 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/d8ab7483-f4cc-4d5d-a08c-1f807e898def.json and https://artists.proofprofile.net/proofs/artist/d8ab7483-f4cc-4d5d-a08c-1f807e898def.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 0xe9ef6192b73e4067fa2119a27a8654302a3068cf8f6290662bd807b31b2c2480. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/USHM91419370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6722ae5b213b832c1f332d95087fbdc7d86373d9d1e490c078743b53009ff95. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/USANG2285280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bd7fa2c448ec18f83e4139193cfc8a3c23d6e6f794144b3a3c718305863044c. 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/USANG2285285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8636553f292da18753379380c6ed08b1bec1b0eb7cfe3e796fa3ed62fae0b26a. 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/US3DF2250955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x903c98bdec3593b4d9e1c5dcdc6d7bf241c571184ddb9e84f5cacfc78a038219. 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/US3DF2236715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbffdf18b60b2fefc3beb10daf4a3b21a7c42bd63b9e25ac087e5f39b9d781e2e. 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/USHM91881484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cf197cc22608ebb0c66dd420653df2b02d13775e9b55180284c0731a95ca9c7. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/US3DF2428350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e1a1c9543f452a04c4be4cdbf3eb68ec76a1464a906becf6a5e59ba22b401bc. Chain 2 (Bitcoin): anchored in block 960419 (2026-07-31T15:20:33Z), 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/US3DF2428351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46558a0b84472ab05b65ca6f3aaeab732d279ef09eee0b53c91d3ee1a4303a09. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/USDY42072581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fa660e93ebff3a4d462d623fa368e1bd5e24182ae06e0df278d709f9e8d425f. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/USANG2218752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc758a6fe85e97f7d7ba5f0e625e654d3472c7e77d8f9070cf38074676003ee9. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/USANG2218743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35359785b517e5691be528b5d802c3dec378ec87853527a29da56aac4653f713. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/USANG2218745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f952fbc4427f2ac2f42cd9b8ef7e03065d52b9bcac4c06defd69735b0a92efc. 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/USANG2218740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x446ecc6827b6bb8dd61705b6037c23376e4c7c24de972f3403040456b211ccf5. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/USANG2218755.