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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6d7bb1840bafa2a8093b0b0f30a7fa22b72ce15e628f5ba25b560fa7d5dc236. 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/1a1735bb-58a9-4af8-a3ca-fd0db7c9c210.json and https://artists.proofprofile.net/proofs/artist/1a1735bb-58a9-4af8-a3ca-fd0db7c9c210.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88d770d7c71c0635eb4ded13f783db3f6eccf91ce827e9d0dfbe1788304f4951. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/ITB001900349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x770a68c7ea64aa6ad4eb700df53d627a3e4ec583cc9e9aa1069f3567ea97b5c7. Chain 2 (Bitcoin): anchored in block 958504 (2026-07-18T05:41:32Z), 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/ITB002000436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dbbde83c50f3c146745b22db014009e33d2da7b7a86527c4bb24478fb195c36. 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/ITB002000455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5adfb78a1e548624d648d5c384ef8c3675f1c0e8d18ec5b94e66638ef83dde4c. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/ITB002000457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd97b96b385696a81ce73b51cfdaaaaff60675d1b6b4b2b1c886038f7636babc6. Chain 2 (Bitcoin): anchored in block 958124 (2026-07-15T11:02:27Z), 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/ITB002000459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb348858feb5ececaf523fab0d9cefc8deb414d2429dfeb40ce97239e3251133. 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/ITB002000463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2ac1fa50e303d7484e42da88389ffa2ea621862f599e1b9ca0928188aab303b. 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/ITB002000454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dbbde83c50f3c146745b22db014009e33d2da7b7a86527c4bb24478fb195c36. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/ITB002000455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5adfb78a1e548624d648d5c384ef8c3675f1c0e8d18ec5b94e66638ef83dde4c. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/ITB002000457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x770a68c7ea64aa6ad4eb700df53d627a3e4ec583cc9e9aa1069f3567ea97b5c7. Chain 2 (Bitcoin): anchored in block 958122 (2026-07-15T10:25:47Z), 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/ITB002000436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd97b96b385696a81ce73b51cfdaaaaff60675d1b6b4b2b1c886038f7636babc6. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/ITB002000459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb348858feb5ececaf523fab0d9cefc8deb414d2429dfeb40ce97239e3251133. 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/ITB002000463.
MACCHINE (feat. Nicola Siciliano, Bresh)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14dfaf642854f9db041a2e2334a8b931499499e863c3160e5a47fb9a556f4072. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/ITDF62277088.
Amore lo-fi (feat. Nicola Siciliano & Madame)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecacf16c2a2fd5473315e34314dfe8e8b558657759a32ec61652085a732a39f4. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/ITB002200122.
LAURYN HILL (feat. Nicola Siciliano, Guè & Joan Thiele)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0253c8c21a9ead082efff1280cbaf980edbd81c50cace4dc0e7dae10639700e. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/ITB002300770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fdb750666dd5107c4c5e53cffa456f71aa2b5072cbac7d34e4295d1daeb85df. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/ITB002100209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8952dc66756ee856bda5b3ee6b6e2b099ba639b5896bc1b2985accf6596dd6c. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/ITB001900029.
Mai Più (feat. Nicola Siciliano & Wayne Santana)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53beecaa8586396d55c81f1ef0108bc2a9f1ec204523a74a2e90b663d008a9b4. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QMEU32118146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5ccc6ab94a4415d6a09c7c56051fcb18e63fdbe550a35cfd05619a04a3765c2. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/ITB262200060.
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