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 0x36dcabf6d544bf6aa4ba1d7de033b93ed367dfb536d5ff7d00ce34fe7223ff3a. 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/0142a8ce-7144-41a6-92a6-c3f6590af8d8.json and https://artists.proofprofile.net/proofs/artist/0142a8ce-7144-41a6-92a6-c3f6590af8d8.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 0x0474d9deb4b8baec975c56d2a755e3b74820eff8dd54849c7ad1924218f4862e. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZZ7N2469030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc02c249faea61c5bf38e950828d559b9e9e75a8e2d21ab2f147e3724e1b497af. 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/QZZ7N2469031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb13be1c338ff30a20dd48f9c0acf54ce937587ee5e11e34798869f9fc626f242. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QZZ7N2469033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3e37b2f11214f4437682dd21a9b6b74d54c9833e9e03dd427109fa29d5ec619. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZZ7N2469039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x206f930ffc85d5369f263d6c4f8a80f47a26f90ce25c35aa97295a422e4070a7. Chain 2 (Bitcoin): anchored in block 959091 (2026-07-22T02:33:54Z), 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/QT3EY2462552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1a059ab2930caaa35a522a342b35da769e616e7f16b286192dcc23dd9bf8ad5. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QT3EY2462553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18435a04eed28d97206b00d6a655aa118398e15665edd382a32f703ee6b8c4b7. 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/QT3EY2462554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2c5b4cb1643bf0cbedbf5cd8c6b9e01785d2844c9aff9919ae12426b3cbf85a. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QT3EY2462559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d33dae647e4bbe9a6123eb2bc4847b2d7fbc04fd38a85380e1e1b3ac71b2d8c. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QT3EY2462560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2ff553fc840b8ca0b590e9677057a32162ebcfbb3b16f150d217741d1509003. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZDA42548241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x964466cf05fd061c5e4773aa843cd5b5697cae4afeda64da47424f20c17f83a0. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZDA42548242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2c1097031d5152f8c89827c707d1e9128d69da9892770b91eba947e93d0f44c. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/QZDA42548244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a06ed6b698cedfe84c038cdd484b406de9c380177bf6f1bb1e2afec982a3071. 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/AT1962500840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74560d5dedf0019cee10f0c1be536fca57baeaca17c6e2039b0f9bff5d89e08f. 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/AT1962500845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x220de792267cbfd319a60271a8f891d98600f070eb3b6ab42b693e807449ee16. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/AT1962500846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ee186eca39970d9b291f496faf298e746214922c8437565e02bde6eb41a7337. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/AT1962500841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7238bfa2a31935069f047f2fd81fc47846eef4270ca8fcc4d8fd99844adf102f. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/AT1962500848.