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 0xcf6bc2ac06fff40d5aac079642fc97f03166e08b88ab77a0c5508ad529cdcd21. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/602903cf-e5a8-4397-8e75-07c38ed846bf.json and https://artists.proofprofile.net/proofs/artist/602903cf-e5a8-4397-8e75-07c38ed846bf.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 0xc7e39db27ece17207fcc1b8b4888efb0584f851eadde2539c4d593cf183dedf9. 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/DEAD62306101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4d21bdfdcb1e60c51f24472640a72ab419789dd30eb505fbb22c8f1b7926d16. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEAD62306102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dcacc6cce5cc2687d5cc7e29d0ba9f6b726362e70177b6c108cd4dec4a6ba74. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/DEAD62306103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d4aa7f3003826e7b21427190b78bb4f2a63edea3ab569720f577dba2aaa5c97. 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/DEAD62306104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe56da24d4e032a04d59326af62778f5448a599c9fb513ec37cc6b0088947c9f. 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/DEAD62306105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc47960533e4aa6a81264ef76e44099866fdea6768f4555b0ab8af5709df25da3. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/DEAD62306106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e4950ce4d82f2e48b56e02e039dc38ce28e6f4fa4eba59a5f3b3f5f3e33f24e. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/DEAD62306107.
Requiem: Offertorio: Domine, Jesu Christe
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4f29b6039a1b1af1e7e4b875377ff43c3f493ec1d702799ff30018e703d08da. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/DEAD62306108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e47799815792acdc90191ffa404145709f693a59e4a3fba4885567c83d973c0. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/DEAD62306109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f453d0e43d3a8f9312704e4b658c32aab53d7350466b00fbad9f0cb9af7833e. 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/DEAD62306110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ae900d247bba08823528c74dd40188477813eaef42518cdfad4239e47774320. 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/DEAD62306111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fc81ade118140e535b4a6bb4c19c1db71878612ae283c90a9f5e0ca24e7242a. Chain 2 (Bitcoin): anchored in block 960173 (2026-07-30T00:11:40Z), 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/DEAD62306112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cb6bbe63dc147a806e13cfb3a53305745cff7c40ad58610b1fe4f8d8c6814ff. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/DEAD62306113.