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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4b8bd6362418575cadfa3091008c0ae9946618b3ee4d92f036952c15ed54a3c. Chain 2 (Bitcoin): anchored in block 954659 (2026-06-21T06:14:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dbf6ca1c-19f6-4303-9b53-463598f6f7b6.json and https://artists.proofprofile.net/proofs/artist/dbf6ca1c-19f6-4303-9b53-463598f6f7b6.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfd9e1d2f11cd20546313b81adaae201eec03444dd74a36185a77fb3f25600c2. 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/GBAYC2200129.
Baird: 4 Love Sonnets: No. 3, Słodka miłości
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2880820e66521b419732a430e93301cee533fbf5d0477af7c111d452776ed9bc. 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/GBAYC2200132.
Szymanowski: 12 Kurpian Songs, Op. 58, Book I: No. 2, Wysła burzycka
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd32172a771bd1119eaefed8228cdceef5453c1e3db65fef94200ea0e20ba6b0b. 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/GBAYC2200135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a20bcef441595998aae3ed19ba5154ca1420be2082171098cac4024c080f785. 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/GBAYC2200138.
Karłowicz: 10 Songs, Op. 3: No. 2, Z Erotyków
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa980a9729780fd56da17865128b7089e11c532b36d9c1b961298e219e3c98d5f. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/GBAYC2200140.
Szymanowski: 12 Kurpian Songs, Op. 58, Book I: No. 3, Uwoz, mamo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe78441de7967aeffd35e7f1a873e0ba96fd53da475296ba4633c133ea40f995e. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T19:28:02Z), 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/GBAYC2200136.
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 0x69296f22fb8bd237245a06cd80dc293511913c4c779069782d301c907aee1ee6. Chain 2 (Bitcoin): anchored in block 960277 (2026-07-30T16:10:47Z), 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/GBAYC2200127.
Czyż: Pożegnania: No. 2, Na wzgórzach Gruzji
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c042ae65c4a7fde6cf832d0e04eb27872744680ba3b53f6fda3e922529b6279. Chain 2 (Bitcoin): anchored in block 960153 (2026-07-29T21:57:12Z), 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/GBAYC2200128.
Baird: 4 Love Sonnets: No. 1, Spójrz co tu ciche serce wypisało
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9474cb0c5878a9ac4424333cae9c44433473968f629b119b948880315dd2d5c1. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/GBAYC2200130.
Baird: 4 Love Sonnets: No. 2, Drwię, mając ciebie, z całej ludzkiej pychy
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88ae2cb6fbc90040083821bcbd8bc2375259da53228e0b06ad2e35bd2206339f. 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/GBAYC2200131.
Baird: 4 Love Sonnets: No. 4, Jakże podobna zimie jest rozłąka
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6caa3edec3b1aa4b038f02c6436ec5e221d2d10cfca56bec87235fff6cab3c70. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/GBAYC2200133.
Szymanowski: 12 Kurpian Songs, Op. 58, Book I: No. 1, Lecioły zórazie
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7efa7cdf21c98454f750a851a9e9161b90eca94ef299dbb767debd328bf25179. 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/GBAYC2200134.
Szymanowski: 12 Kurpian Songs, Op. 58, Book I: No. 4, U jeziorecka
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc39d494dba9492795581385f77067839f591482c9a9f6f3d1d0415552195fe9. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/GBAYC2200137.
Karłowicz: 10 Songs, Op. 3: No. 7, Nie płacz nade mną
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x157750d7247fc9906b7ed023d24da9f3eb8156b765d80bfcb7723b141f2df446. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/GBAYC2200139.
Karłowicz: 10 Songs, Op. 3: No. 4, Na spokojnym, ciemnym morzu
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb804a66eebe86475b9636ac6988c2195c565a3f3764c4ae2148f482151f74e7a. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/GBAYC2200141.
Karłowicz: 6 Songs, Op. 1: No. 6, Smutną jest dusza moja
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x818fd0504f07f22bacf346ab7026a211699c1b06f9065f996edf04652db25838. 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/GBAYC2200142.
Karłowicz: 10 Songs, Op. 3: No. 1, Mów do mnie jeszcze
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f55786f004bf79818f343673ff1b4d61bb84938a012b16aeb1af3ad474c92a5. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/GBAYC2200143.
Karłowicz: 10 Songs, Op. 3: No. 6, Przed nocą wieczną
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6346937ffa0a91d1c333b53b2bdb4a85fcc88d4468ad981284f3dcfa1d93878. 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/GBAYC2200144.