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 0xa58c0a79237cabb8573c78517eab605feff8f141a82bcc7fafa6408f2ae2fb39. Chain 2 (Bitcoin): anchored in block 954134 (2026-06-17T19:41:05Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7ebdcbc1-c2a7-4c0e-ba1d-0ba8086cb608.json and https://artists.proofprofile.net/proofs/artist/7ebdcbc1-c2a7-4c0e-ba1d-0ba8086cb608.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Barber: Summer Music / Carter: Woodwind Quintet
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 0xf6a4081119cdbbf26a631233acd2ddb1c96a3a80f1fcb40cf64137ef0db99710. 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/SEAEJ9852010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfa210eaf75c81bf99799d44f1d28df0b813efb373bda135ea221b06c794d3d1. 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/SEAEJ9852030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b2a09f14bfcfe641f87a45819bb55d9fc468178d3edb3b85fd637710bd61ef6. 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/SEAEJ9852040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72d3bf1be01486345bd066b503d3260e26694e1ce576b9f0edd7d12bb0cc56b9. 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/SEAEJ9852050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5de10542897a239c59f8f8f3a0365c7a0f0b7a80cbbc659730bb45375b013b5. 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/SEAEJ9852060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbc9e8e2e294e69b459783abd0cfafc37d75149c3180cac4f8bc95b5e8c6e0d6. 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/SEAEJ9852070.
Suite, "Belle Epoque in Sud-America": I. Tango
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb056e65cc7a5884dac766251b4429799dd72136b52a4bd0d0c8521616f513298. 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/SEAEJ9852080.
Suite, "Belle Epoque in Sud-America": II. Vals Paulista
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8bf28428ec2e41ed6d1b436b7f98b82c0400e44534c7acfd806597239caec54. 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/SEAEJ9852090.
Suite, "Belle Epoque in Sud-America": III. Chorinho 'Walter´s Requinta maluca'
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f6219504e981b174a529ef9a9c440fd9b67a20c200795a0e4c837ad3e2fee2c. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/SEAEJ9852100.
Suite popular brasileira: I. Choro em Berlin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3793773da58542aaeb9943991dc784357ceae859c19ef9b391ab4105d2b20d1. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEJ9852130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1cb81eba2e1cd8a38ecf37607747bc46c4c35aa025d260adeca59d220340f70. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/SEAEJ9852140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe738bb650f719351ab7ca0522074f3fc55a34c16000017eb0b780c42486e0ae5. 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/SEAEJ9852150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a2a9887a5f8f8890b49234c413206e07e5afe97eac46bff9584e3f6f0ba8e40. 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/SEAEJ9852160.
Concerto for Viola d'amore, Oboe d'amore and Flute in E Major, TWV 53:E1: I. Andante
Carl Philipp Emanuel Bach Chamber Orchestra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7c56169f0804bc69fd1b3df65972df62002fb9c73f0b6d1788dbbf7cdf936b3. 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/USSM19910676.
Concerto for Viola d'amore, Oboe d'amore and Flute in E Major, TWV 53:E1: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57fd3890b8fad139888da93d864902998fd7015ed0004818efeeede180f8355b. 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/USSM19910677.
Concerto for Viola d'amore, Oboe d'amore and Flute in E Major, TWV 53:E1: III. Siciliano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x261eaee9c1a7568172cf8abaaef0745a6ae2085546410e8518e1d6aaf1f51b4f. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/USSM19910678.
Concerto for Viola d'amore, Oboe d'amore and Flute in E Major, TWV 53:E1: IV. Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1f96d06aa2413ebfecb4db158b6ca6b1f7c2f73d55da23bbbf0e6c9a8eb71e0. 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/USSM19910679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96965d77be0b3e465e4da9fdfa43cc51213819d187d88989e9146b458a47cb76. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/DEN961000240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa386b0363cd5dd896abc89c68e2ae7d92cfbc1c49f3b7f711862f8e7ec3b5288. 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/DEN961000260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed8a00514b0529e72cc2d7cbb48dbcf5fa22c9d03672d6131bc5b1e55cfdef35. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/DEN961000270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf72029c4e5a286b775149f5c434d9e6c35e2bf5fe191ba44ee41007e4eb65de0. 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/DEN961000300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28ddcce07978da50b09d57c35020980482c3cf71367229cb5891100adbc8b0b3. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/DEN961000310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6354f1e4444376888260f23afb818d9ab38846177d7562178e519347f7138796. 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/DEN961000350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30383f32ed95ad66846fb642a514fc1ee9aa1949ef6f45d96e6df4a83dd8693f. 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/DEN961000380.
Medley: Cielito Lindo - Mexico Lindo y Querido
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52f21f88fca8a468bdcbbdeeb58af378093db9887661f4fe6593c68729e61261. 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/DEN961000390.