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 0x8f816a037b5aa6f4f003246bedf92806deef171d9db84761fb39a591f4c4698c. 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/9d0d00df-7e6b-4690-81a4-ba6ba2ef79b4.json and https://artists.proofprofile.net/proofs/artist/9d0d00df-7e6b-4690-81a4-ba6ba2ef79b4.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 0x0d4f672f9e14a9e3e104983fc7298024d2fd1496b19683475b9a59e0191e8c08. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T17:18:59Z), 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/PLF241602476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f56632431e77421d342cff82503f4e52a663a3137f71792eb10a963890f2450. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/PLV401900543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a2e9fc376cb032d680749dffa3dc3571ae59bf79b0e8c650073cdebc85b2f24. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T20:35:41Z), 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/PLV401900544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23af1322dac20732ac3e2d2b18cbc7105c8153a2243b54e3b2f8f12bbb444350. 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/PLV401900545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0050164b4555f069aa7850cffd7b110740f3373c0de707c8f05f0789cdc98fa8. 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/PLV401900546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x891b239a08a2ef3b41dd323ee3c24dab47d088632133414ecf692f1cc8e737eb. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/PLV401900551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaca29ae7b827d6d198d6b22773edcfda9c421eb66ee08983f908831a454d7758. Chain 2 (Bitcoin): anchored in block 958514 (2026-07-18T06:54:37Z), 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/PLV401900552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66eae21163e01414392f5111dc3db8f76b372d601a326ebba7ae24046274173d. 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/PLV401900433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x963a001ede6ac2c27cea2ff69cacf932a4e92bb55eb4bc8be4cf00ab41f82787. 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/PLF241602635.