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 0x86c9c1662c69fef342f29246574d191a1ec022c7397c0e70950903530ae93448. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/52d73758-becb-430d-8bd5-6a05a0762e16.json and https://artists.proofprofile.net/proofs/artist/52d73758-becb-430d-8bd5-6a05a0762e16.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 0xdeb1917613c1195c5153a75bb42f90c3324ff61e0352f5550fac083db477c3f6. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/CH4210801132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89cfd9d0c524a659b28f0cb5e93b1352e7ad6141b53492789c585910b0b3480a. 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/CH4210801136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25c267e27ee275bb8a5aac546745e87432bb039ae2f20cf44c1174c56a80750d. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/CH4210801138.
Planctus d'après: Pax! In nomini Domini! (Marcabru)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x084535f56ad44faf5324e7652c2544dc4fdd59a0475118091ced20cf4c0c4a4a. 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/CH4210801144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8674fe18331a8c89c618d40ca4ba525c5bb743aff148f0bbc8cfed86d2442e63. 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/CH4210801146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1799ca39011aa322134f78ce9384633deaa663fdaea39287befdfc94298ed59a. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T08:54:27Z), 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/CH4210801135.
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 0x804509328ff53c84ae8cebdefa57a24ea98bf474e88d2026421cf1269c6dba0e. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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/CH4210801133.
Estampie Ancienne d'après: Kalenda maya (Raimbaut de Vaquieras)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1845a55e055a52e0bb07b7c8bc43721dcf43b59b8a6285ce381992d3b1f2ab2. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/CH4210801134.
Chanson d'après: No puesc sofrir c'a la dolor (Giraut de Borneill)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc844a0310a6a62ab98a41c5f12f2fa8ae42aaf89d16d0bcb663f4b7385d526b3. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/CH4210801137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe89707f8eed26910b6bc2295927e38b3520fdc1b6a8952b741c1ab491807e84e. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/CH4210801139.
Estampie Ancienne d'après: No m'agrad'iverns (Raimbaut de Vaqueiras)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2ed074730e8a2c11bdfffcfa2c3be2edf32688cfb90f9548d50375ef2a70462. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/CH4210801140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb63b94ee37bfea5f0f770600aae4ff12a4510af8984af25356eb1388297c90d8. 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/CH4210801141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf11427097dd39bf01e47a4c3874c90d69cd2a37a3c41d5b9aec3d1b6b29959cb. 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/CH4210801142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e45606b69121de788ac425bdff7f6fce8e117b1dd711b39965805946cf95638. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/CH4210801143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c6e9d62617ce6cdfeeaaf3ace40c53c4ea8e0ca8e7b032c27802f4779a50771. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/CH4210801145.