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 0xbc186115aa7dca732ec4eb4a69c657811c535e57cb5081cd34e91aa96f1ee9fd. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/aa3fb065-3493-4101-b3aa-fef5230fa655.json and https://artists.proofprofile.net/proofs/artist/aa3fb065-3493-4101-b3aa-fef5230fa655.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
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 0x898d8f087c55e71e320e5a023c35ef58dd42b9e1aec94df36ffed5fb8b047679. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM71702250 — a six-check JSON result.
Harp Concerto in C Minor: I. Allegro risoluto - Un poco meno mosso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fd9e1a36a5f2455112f27298bc0ed52f3364790aafc5819b05694689c1a86f1. Chain 2 (Bitcoin): anchored in block 957065 (2026-07-07T16:43:21Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ131502010 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffb394ddd3631c2456c468519955d346c49194994262b3dcd06ed70448011975. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ131502011 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c3e32c08041adfc5ee8d8fbc626f5e354351ad3d8e193b0f17b7b0bb48203f4. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ131502012 — a six-check JSON result.
Harp Concerto in C Minor: IV. Final. Allegro con fuoco
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd54ec45763b6291fa26569ba2068989c401ad56ea33ae79a5f13b727f4d71a43. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ131502013 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd42c7aed5f37943fa3835c23009371e58064fd286e4cb4c6edac85b7ff57fbc8. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ131502014 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd999752f4addb009506e01383d8a21e362acd389020a68bf1a47d6b790960da1. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ131502015 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec5aeb4906b5b833a4339fe040850b677bc391ace6e8a7aa22f40ec6c69e0467. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ131502016 — a six-check JSON result.
Verdi: La Traviata, Act 2: Ah! Dite alla giovine
Puccini: La Bohème, Act 1: Sì. Mi chiamano Mimì
Ô mon bel inconnu, Acte II, Second tableau: II. Trio. "Ô mon bel inconnu"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e1a7c68b59342e36042d938319dab0c96c7f53bc22135c86f3636d990bc628e. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITJXZ2000415 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88e2a7994371d92f7c519d0232bfe1940b988e8f1561747f75b65e96687f13a9. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM71501776 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00d43ced1ca820846bcd0c15f79e6f2acc140d67689a1008626c3289dd7f1854. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM71501777 — a six-check JSON result.
Les mamelles de Tirésias / Act 1: Scene 1 "Non, Monsieur mon mari"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa55654a026a336fc2c12fe577f42b8acecd35a34e12c1cd31ce1c6b7fff371e4. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM71501778 — a six-check JSON result.
Les aventures du Roi Pausole - "Pardon, mon papa que j'adore": Pardon, mon papa que j'adore
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2d6ae3c2467310394d43fbce5b75a1476e8c7b16dfb2ed40197237b57b0811c. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM71501779 — a six-check JSON result.
Opéra de Quat'sous - La chanson de Barbara: La chanson de Barbara
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e78ff2d463bab75582ace5681018d9d8ee1a0176c386b14923ee2cc0532b8b5. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM71501781 — a six-check JSON result.
Opéra de Quat'sous - Complainte de Mackie: Complainte de Mackie
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c47cf73dbbfb3285246ee233093ef3ffee8b2491d12a7fd41a621192aa774b8. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM71501782 — a six-check JSON result.
La Pouponnière - "Je n‘savais pas qu‘ c’était ça...": Je n'savais pas qu' c'était ça...
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75fa2a0e965edff3d6c6ec3f2b24bfafec72fd71d30b9dc4fdf8780fdc04adce. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM71501784 — a six-check JSON result.
Phi-Phi / Acte II: Ah cher monsieur excusez moi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4db8fdb961e2e77472d25b0859dd388f7f0fbd31e4b054cfaed95a04eaf65b3. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM71501785 — a six-check JSON result.
La veuve joyeuse - Air de Vilya: Air de Vilya
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59ee03e59b7230f8875034e45d0f85428dfe57d8ef82503fcfd108699fcccc69. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM71501786 — a six-check JSON result.
La veuve joyeuse - Heure exquise: Heure exquise
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dab9c9c69d053ef3cc66b6f65563d3bb6757743c37be811cf7e5489def0a418. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM71501787 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6ee37e1bd17864e7b67cbb0da6d70c49358160634bc4eec0d0b146b5071cd23. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM71501789 — a six-check JSON result.