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 0xddffff047af8a05b0a050f831f80ffbca7422eed854b5ae24f2e26f102d4fa4a. 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/7dc46a8f-ed3a-43d8-bc75-1ebe866ecbe9.json and https://artists.proofprofile.net/proofs/artist/7dc46a8f-ed3a-43d8-bc75-1ebe866ecbe9.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 0x6f6d2e284c98f900e194e0315242f489d0b5719ec61b2528ae2521006bcec6f2. Chain 2 (Bitcoin): anchored in block 960383 (2026-07-31T09:50:37Z), 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/ITBA60500028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb885c3c1f1051add6e347c928ec6d8003a1c9b32b6a537eff6a10755014029c0. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/ITBA60500030.
Contemporary Collection, Vol. 10: Modern Music for Piano 2
24 Marginals for Two Pianos, Op. 68 No. 1: Am
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33fa23c4934b611bc967a671af42bec9419237ba65d03c91e3123605bae75b84. 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/ITBA60500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47368dcfbe06885227b5bc0bdb6cbaca77a536daa4e05b8fa8731c5ea10d044a. 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/ITBA62400082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1255298f0f78cd2ff540857b7b9c5f03ca22497a4e545e34ba5d568c3c3c0174. 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/ITBA62400083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18ded0199e43b43c90627e8b894bf571b977d87c3234aaa7ccc8cd5ac0a531a5. 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/ITBA62400084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96603e9963c1a313f01157c6bf8ed2cba547c0863a4c810c1566338d5f23aea6. 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/TCAIB2420272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x502b3f6b3970d90453fe400638e05487aa23fa0c320e8df7ddf851ec7e90464d. 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/TCAIB2410601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc00d618a6093dba3c0b0605c5438846ec5b05cd026b50f01e833dd598fddc34. 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/TCAIB2410425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b0ca872442b0bd9dca9ebaafe19dddaf1ea5e99bab7b2dc91fcbb07242cee51. 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/TCAIA2475133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x165cfe595f130b05eb23955c2679195749dc630b9b6445f68ed9dd8d7185dda7. 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/TCAGY2399521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc00d618a6093dba3c0b0605c5438846ec5b05cd026b50f01e833dd598fddc34. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCAIB2410425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x502b3f6b3970d90453fe400638e05487aa23fa0c320e8df7ddf851ec7e90464d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCAIB2410601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96603e9963c1a313f01157c6bf8ed2cba547c0863a4c810c1566338d5f23aea6. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCAIB2420272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b0ca872442b0bd9dca9ebaafe19dddaf1ea5e99bab7b2dc91fcbb07242cee51. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCAIA2475133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec7d61b47df83dd1e11915b222c672e7aa7eab1670085073ba92bf595e1d522a. 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/ITBA62400079.
Trois Gnossiennes: No.2, Avec étonnement
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3be375012580a40c6ba11ad3622afdd61270c0d91be86a0b81a2f41c7e1926aa. 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/ITBA62400080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbc070fe957ad70062481ac78a9e958976fed1d1182cd409157448341d23d531. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/ITBA62400081.
Sergei Rachmaninoff: Vocalise, Op. 34 No. 14
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5db6a01500182b169d0c942dc6565342f451f7e950b6a72a0a1fe8b0ac9a6ef. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ITBA62300078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c88d18153d22bca1544c1b0350b204ad5d12de514273a79295d438ffdcb8f6b. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/ITBA62300076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1ac7b4e3e822a62269e3d7beb69d3e6d632d7b1b483a04eca4905e15e8999d6. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/ITBA62300077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x853e6a22cf0a7f70a0976ea2a46851b036203dcae62474a15e4f13c533acf1d1. 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/ITBA62300075.
3 Gymnopédies: No. 1. Lent et douloureux
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfec4236ae223c68c35146357527205be7b5f94468aae29547bb3beba746541c7. 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/ITBA62300072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f81777b6f6439e738ad2a28bdae2c66f319ed932d197e5f23f07333859a6155. 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/ITBA62300073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a78b9fef4771b1f30f60581aaf1559200eaa13d07fcc22419a0accc57802f5a. 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/ITBA62300074.
Sonata for Violin and Piano in G Minor, L. 140: I. Allegro vivo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacbf748d2f2a98e819055d544bee96c416359a41db9e16d05cf9e2d09eb77b3f. 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/ITPRO2200001.
Sonata for Violin and Piano in G Minor, L. 140: II. Intermède (Fantasque et léger)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacaa23be27d3dcb01ff5e17d6702f82b68e3c6f098573c8e8ef51ac186e23dac. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/ITPRO2200002.
Sonata for Violin and Piano in G Minor, L. 140: III. Finale (Très animé)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e6615c807d6ced4e5877649d1c067b8bc08d07789caacd739ee60b2fe3ba949. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/ITPRO2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b035d0b6c22abf9ecef731ae96cd42377a32926e8d1372a99981872d0010b1c. 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/ITPRO2200004.
Violin Sonata in G Major, M. 77: I. Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e8897532396d4b9655d5719abcd087241ad1732178759fdf01cec1cf9486008. 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/ITPRO2200005.
Violin Sonata in G Major, M. 77: II. Blues (Moderato)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23d10fa7e96cd9a883a611bf05acd892cda97e66ecbdaec0b0c2098cf8ec93d0. 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/ITPRO2200006.
Violin Sonata in G Major, M. 77: III. Perpetuum mobile (Allegro)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee517fca19a6c777806638dfbf5845e70d5631cb7b58fc30ca7323b2651cd26e. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/ITPRO2200007.
Pièce en forme de Habanera, M. 51 (Arr. for Violin and Piano by Théodore Doney)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78e673f8c25b583bc6e63cfdbbb4799e297d23a234d048a99aeba976ed2655aa. 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/ITPRO2200008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4cb9ed1b2f8c4d80bec25222d634bb6250901416775ad84a7faad4f57a2a8e8. 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/ITPRO2200009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa45372afe86ed25dc2672cc94d67392222e9c0efcfaa04b2e8e757f55651b466. 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/ITPRO2200010.
Quatuor pour la fin du temps: VIII. Louange à l'immortalité de Jésus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb61b47e5cadbe7fc89be349952dea7d0c81503512154ecce9569b02326d625d. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ITPRO2200011.