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 0x6a39e56e601d753e942e4d492ba96a78939a7b9a1cf07d4a6e6a0e7733fc3233. 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/be20e5d5-e7f7-44d2-be85-d976c1f2f308.json and https://artists.proofprofile.net/proofs/artist/be20e5d5-e7f7-44d2-be85-d976c1f2f308.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 0xfe125958088db1c31fa12fa0a3d646486c9caad1a008ee0318f0ecfcf47178ec. 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/QZHN82424008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb7a758363b857ea2cc04033768cdb6a25b74b1c060a3264e9add89ae8fa3f09. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZHN82424009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa07945cf172d267440f8fc125fc6da571e932f736a9cadb9485564f20c60a001. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZHN82424011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9d223c907089f8af36c20008db3a8809489d757a0af6f1295a05dc850c463c8. 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/QZHN82424015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80ca2e0a970259b3e231caecb8cbba85e85c3161c538a824a726e253cae337e9. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZRP52451639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x323cb4b4692047bb762474f78e85e705ec8fd26a1d85eb3655e948c62448d45b. 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/QZTAZ2462953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41c95bf208eb299aa18ee3751e1dd7e7e3121aa9c4964fd803f452bca9aa7f90. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZTBE2487691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2845b517ed7da00ab550c1037a96658cb00f4143b553856b5044ac2b6564156. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/QZZ7R2447793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab0107f3876c754024c1760cb7f0791ab2781198fc407b99190e0675f55a0a09. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZZ7R2447794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf031f82c785a4337762f14f33677791d926fc78781044ef511ecedb40ecfaf21. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZZ7R2447797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac4f3fb41bcc1af182a7c5d7a6cc07c0c7b8ff29eec5e40361a68ccd7aba9dc0. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/QZZ7R2447798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9508588995c08b9ed9ed5c273bcb5db39d01207cefad602a9c9dafac406523cc. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QZZ7R2447799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4cb4a654fd639c393a7fe63f3e9f24e88c949f676831e6e7fb1d943df5f10f7. 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/QZZ7R2447800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x255594800e1ff48db961b0897982638a0241df01bb8fc4584df7718e807a9b90. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZHNA2511061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd0e3b7c3d2089efc029176b38cc656325398568958c62edbdd663193f761a0e. 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/US38Y2570728.