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 0x3b14000ef569c3375aa66145255f5a205aabacbf058fd221dfe8add056eaf1f0. 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/350630f2-2998-4ce9-9736-13749325213a.json and https://artists.proofprofile.net/proofs/artist/350630f2-2998-4ce9-9736-13749325213a.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 0x48b5e6bc6b936072cceab7d4148617af99f54ced4c8cf758e720cddc36723475. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/ES71G1777735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48b5e6bc6b936072cceab7d4148617af99f54ced4c8cf758e720cddc36723475. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/ES71G1777735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd38a0c702fc675d7c1a57a9bb2a5f47e6041c123b76149c2ba8ffeb345e74d12. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/ES71G1777736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f2ca0ef4628dbfc494dd5c17bdd55035290183b68e7f1f4955381e9f2e15097. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/ES71G1777737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e2cdf322ffa670407a0c11d61a210e0c62a966ff3418fc1e61f5dd6637fc82b. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/QZR422400019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47c008d9bfe0bf8e4fafd1fc2a320394c9e9a9b993111d5cdb4cb92a5be33b5f. 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/QZR422400014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fc582013d71570721d3f05b79030dfba1a783ce338f14ac8990b9991e31c0ba. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZR422400011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x438e04ee96bf9c5e8026a7ef094f3eed2e956b4a49cba2dc238cee844a88b3f1. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/QZR422400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x714f2906a0d9612abb635632b003637584a7d313fbbcc3da66c88780560947d4. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-17T00:34:34Z), 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/QZR422400013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47c008d9bfe0bf8e4fafd1fc2a320394c9e9a9b993111d5cdb4cb92a5be33b5f. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/QZR422400014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaacdee0615a033181a1f562703effd6e3f626d61f8170d7a30bd6d636c199f0a. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/QZR422400017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x212564704662c502975fc081187ae071d94893bfcd0d19766c483400e7558427. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/QZR422400018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e2cdf322ffa670407a0c11d61a210e0c62a966ff3418fc1e61f5dd6637fc82b. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T10:49:01Z), 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/QZR422400019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x312f6fdc69edbeb8b853bb7632fa17450601f581067dbadf79b6a22cceb01a6c. 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/US7VG1988213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8a3a949b32ddb48c5a64590d514352cc2fc1c9c9642caf8243d2f931ad83cdf. 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/QZ5AB2063415.