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 0x861ed6790801ccd5113ab25b6e4382be7485b07f9adf293b3a9381b191d95f96. 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/00bebce1-3b63-49f6-861e-8b2a175ec90e.json and https://artists.proofprofile.net/proofs/artist/00bebce1-3b63-49f6-861e-8b2a175ec90e.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 0x978271b2667d7c371279cfe61867fdc3a5a9bd2778a8fbab2074ee240e622de9. 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/ES33B1916701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04378151a2ec59b25223991162ff1f5a660b834a618a2810ab5bf26bb591f223. 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/ES33B1916702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe34da5c2e341eb93ce5d363f8aa7371bf666b1758464b2112d811135a773bd9f. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/ES33B1916703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51a35448b6bb2cb48b4b7a7c2059c1e71df6f22cb876faec8b523f88fd88dfc0. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/ES33B1916704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd31aac253f232a75dee27cfa032a81aa5db421f85ee5869cd2c19b58171d492. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/ES33B1916705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf02e1c5426b083a9389552577d474a05973eb29585a874e6dcf0641da6d0ec56. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/ES33B1916706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x350c46b16a9992c400a1cb5edb1692da51c9ea542b9fa08836b3be35723059df. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/ES33B1916707.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6dd7953e26f11d915ddedba7f2df9b87c1c5aa6db3087438a20ef7849a9f5d6. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/ES33B1916708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f09f880ef50501f1267d2502cd3dfc9f10e298fff3cafd2ef49e6fe149f3a35. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/ARF412400536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c21cc0c766d98bd09202fc44c88f60e8eefa798d64d6692a4ee07a96ff92ec3. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/ARF412400530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bf829d114034610a8fafda123d0eccc3129e09e8a3d12f17a2be6285dc93543. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/ARF412400531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc6be933315e57626a7d8c0d1d24da0377a3ce2325906f1598e3c0233fa741c4. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/ARF412400534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1348600285d563942a7f1b4c8b504ba7271d539e8334f68639bb2d2cf0df0cfa. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/ARF412400535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f09f880ef50501f1267d2502cd3dfc9f10e298fff3cafd2ef49e6fe149f3a35. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/ARF412400536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafd27ffb5a35808d90bf30c1d2f03f11016494faf70e52f4056595f1bc24e652. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/ARF412400537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe52983ff06ad049c08b3bce4f042e12aec01bac66659ab5aaa60778922dc19dc. 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/ES7732102244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4339dbc4ac458e29a8deb9991d8e8bfbd32163b2ec6db33f8a46f50c892b71a0. 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/ARF412100157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda4a4914bb7e41fecc494119011e4e8904f524a0ef5f7c9d6259c28a5e8c9833. 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/ARF412100072.