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 0x1aeaadfd548cf437b16a0fa45d28aee969246fb9377f7ba54f6b9b0efed38ec1. 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/0c3c004c-6972-4e97-acd1-895a8865db7f.json and https://artists.proofprofile.net/proofs/artist/0c3c004c-6972-4e97-acd1-895a8865db7f.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 0xd0f2176333a5406a1a364f919159005a67cf982299d7f96b0fb8769a67c6dbc5. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/ES26B2202220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7bbc667ba468efb298e5ebf31e85295c5165ac139c2718fea734296be002253. 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/ES26B2202225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x605adc8f56b32f02ff5c18ee5505f3261e3375fb01fc6da33fc80f87a14ed6ab. 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/ES26B2202226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb3803ef3548f25c9bf2cce6734a4fc614f630f6201b0c81e1404e6cba27739c. 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/ES26B2202227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x632b3acc4e4e232023bf6054d7b5db57db388090bceb29dd70f3d3c7ced83d47. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/USL4R2164661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe64462f8f4b1175e79d2593ec86bb893c252a1b13f3b81aefe5a0f3adb0d0932. 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/DEGZ92100680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87a8ade75c17e3d8ae23710ca05e19447fb44e5036eb97118c94fbe6742e361b. 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/DEGZ92100681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe280abeb6fc20da31141ae04d6b6a0c0341431243119eda8be3be65334ebe849. Chain 2 (Bitcoin): anchored in block 960407 (2026-07-31T13:26:30Z), 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/DEGZ92100682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x303bdd35f866a80eb638bbe2ab71e9565a76c8416104f791ec4f2aeb5ab2d11c. 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/DEGZ92100683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a4ce667e8074d7e01cd8c035f13b9099ef3c884bf3163430fd30da8357b4bc1. 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/DEGZ92100684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x901df7ce8aead5253df0e5a18a4694cdb1830f0b34a4127949bf804443118659. 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/DEGZ92100685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3775da5fe134cc87c644db03d15116efcb94dad0cf58ba3ced8ffeaeb28f4b02. 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/DEGZ92100686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadc663bda709bdb7a039f9fa0e14c3c49af2e2cbe03391891814e3975822598d. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/DEGZ92100687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa72698401042f94d9f5d2580242a40f9dfa633f536cc3e0cd2c51cb7dec6e280. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/DEGZ92100689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba2bd82deae1826230f1d594920655da7fe1d21fafa739d4242b1d52282f2688. Chain 2 (Bitcoin): anchored in block 960422 (2026-07-31T15:27:29Z), 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/DEGZ92100696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18524d73cf577369801307c495244e5d3b877641a9831bf8ab1664bdaae939f5. 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/DEGZ91000703.
Famous Classical Guitarists, Vol. 1 (1925 - 1929)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e1d2f57470c54bc87a353093f6bd752ada5f458a81e1c317da1169c5c18b769. 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/GRGCM1890705.
Popular Catalan Songs: VI. El Testament d'Amelia
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5fe024d37a0cc163a1e7bf5cbe0722de6e297e236d1940781172b0e0a8ec819. 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/NLY331211778.
Segovia & Contemporaries, Vol. 11: Rio de la Plata Guitarists
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x690046c0ba2327d2bcc04f1e240399084bf314645a10c76bfba1a211109d3d33. 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/CAAGN1695501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3ae2b6c43f940c99f8a92cd903066d80a76da1f255242e576e5ba5ae39d6783. 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/CAAGN1695502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a05979f7736caaa2cd0cd85c38306ef3ba12234058893529c57576ec3056fc3. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/CAAGN1695507.
4 Vals, Op. 8: No. 2, Junto a Tu Corazón
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbe43fb2c8a27795923be9c36a97f7bb4327352c49fcce6ea2a5d1e8c339405e. 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/CAAGN1695510.
Kinderszenen, Op. 15: No. 7, Träumerei (Arr. for Guitar)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd21bbe621c7c10f8134a1e342519cfc2814f3599d7c368f057931e1dd3a7c6fc. 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/CAAGN1695513.
10 Canciónes populares catalanas: No. 2, Canço del Lladre
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc502a2072e24a487f6532a10113c48b81469828a6bfd3b0ce3298b7ce7deab2e. 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/FR6V80788591.
Danza Española (Arr. M. Llobet Soles for Guitar)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c190ebd70df69e670f3d8bd1bfe5921b94631ac8bc34a4eb29f39d733845de2. 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/FR6V80788586.
Pioneers of the Classic Guitar, Volume 9 - Recordings 1925-1930
Segovia & Contemporaries, Vol. 6: Llobet & Anido
Famous Classical Guitarists, Vol. 4 (1925 - 1935)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5809a4656e952e798e7d7ed9e8bce122cc181beac9ef77632c5f02dd333b25b. 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/GRGCM1891011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ed2e0aa37668cbe47e26f87cc1532d610307a93607303b55b37791ddf03d8be. 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/DEYX82168602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x851c81f92ac30eeda4e60362ecd4ed07ef85f6581e65136ff628b5437693fa20. 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/QZMER2324282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaef4cb100b86809f967feb1ba0700e7b581e8804f458d88d22add5391d3af38b. 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/DEZC62205606.
ゆとりのじかん 〜頬撫でるロマンチック・ギター〜
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd283a905eddb4e6eba5ef48bce263037e4e82bf33551ac5a4588b9ea8ce24eab. 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/JPCO01219040.