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 0x21b4dfa2fca659669ebf3409cc996737f15d68169dae53a3c9eada2723c464e3. 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/70a1586e-3596-4c02-a5b3-644b469c2d9d.json and https://artists.proofprofile.net/proofs/artist/70a1586e-3596-4c02-a5b3-644b469c2d9d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Fracisco Tarrega - Transcripciones Para Guitarra
Dezidle al Cavallero: Obras para Vihuela y Guitarra Renacentista
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 0x7a3d60df7e62d7cd9df1f7b774abbe88ee2283653aff01320253b264fb1376a0. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/ES71G2013696.
La Canción del Emperador Sobre Mille Regretz
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91de9019d7da424021044bb752f5edf7b2a1a4872db8b2ba0aead7b78a34c017. 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/ES71G2013697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86abf610f922289eae026cfedabd05f8c0f73b836ad38b205147d60f07a353df. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/ES71G2013701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf53bbe90242a23778ba1a57cacd12c316041304974ae89338772a8ea4311b844. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/ES71G1306899.
Nana. Canciones de Cuna para Guitarra (Lullabies for Guitar)
Various Composers: La Guitarra Ilustrada-The Enlightened Guitar
Dezidle al Cavallero: Obras para vihuela y guitarra renacentista
Clarines y Trompetas. Suites, Sonatas y Folías para Guitarra Barroca
Francisco Tárrega: Transcripciones para Guitarra
Joaquín Turina, Manuel de Falla y Antonio José: Obra Completa para Guitarra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1618ac4521f1f9b65693790c214e8c60715b3b671bfdb7bd64d0f8433bdd6e3f. 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/ES71G2008390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a8fe0b50177ecec6e5be5205d7564e1d5852a4102498bb0d23d3c76744aefec. 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/ES71G2008391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x634baf40fe0a939f470bf5c4988f71fdc278e834f7d7a82e3432f372894e2b1a. 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/ES71G2008392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaca235f835691a660be47c2d97cc46e8313199a4a7bfc0312b67d66be2ffbd2e. 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/ES71G2008393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeaf8b54b548e585b180e6a556b478e7c2f8e3638faaddd359e777a94cb5d2ff. 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/ES71G2008394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee8254dd654327ef18008d61cb17e50eb9be315b891f785fba034aa68e737e1d. 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/ES71G2008395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89dc93a316ceaf0cc41de82ab23d98ccbe4f098b2de0bbbcf5c815492d06e82e. 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/ES71G2008396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x869c672d660b0923d23c9b811509765f243c01ddbdaf19359b9692376bd63c4c. 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/ES71G2008397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62e39516a82c8c1fd0e2261b17bd44ab6b01cfcd1b57022f5e8fdce11d8250f9. Chain 2 (Bitcoin): anchored in block 957032 (2026-07-07T11:43:09Z), 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/ES71G2008398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf843d585b7abab6abcd6479f36b0223d5b9561f47d13d3fae472ebf24fc1e41. 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/ES71G2008399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21ca254e275ae0fc20077c6d6dde0d21c474e64052c94a3ad9dda07d029b3bf8. 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/ES71G2008400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf70fcbeab9746d722edd78ac37bac28e8f528ebf30ada4ddb2ee3007a890adcb. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/ES71G2008401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb44a7046bfcbdf13a6444cf18709394c2cea1adf9e42209538c780520ca12440. Chain 2 (Bitcoin): anchored in block 957011 (2026-07-07T08:25:35Z), 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/ES71G2008402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79b056b34442db4498ba76530834071795436976ec2ff3f212412f4a57e76929. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/ES71G2008403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9b77fa6d944fea5e3ab530328a452f115f66c8d62bb2c7b1fd476188355bce3. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/ES71G2008404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf889492d7f8f473f255bd125a1524c4475986ee4f8c0757993b435585ffe901. 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/ES71G2008405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x376bdf884f2901d8b028486fad749a6f4a19011f8cfe29b2e26f705df28168d2. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/ES71G2008406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa55ada2bc35e82a1e78b651bbf100b9be7027ac06ecabb5058d0b7095e256c8a. 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/ES71G2008407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6cf71ae539d99f6a04c7c194bbb667a43b88eb30e551b9cf86dad63d15a8bdf. 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/ES71G2008408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x881ad1c4e5fe3e7e0f643126827bd1911f97a0407c33b3eae2194fb244f8f94d. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/ES71G2008409.