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 0x7338f7931b48687386898f6eaa2290bd4443bf517dde66a4a2fc9a50e9255617. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e9e571c7-79a8-4a0a-a128-01f82f504dc4.json and https://artists.proofprofile.net/proofs/artist/e9e571c7-79a8-4a0a-a128-01f82f504dc4.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 0x2aea1e0c58192f78d6b5da31d553e5c290deee2359d10154fbdc32e171bd9dca. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/QZZ972437137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdadb474de07cae8a32d38cbd7291d15bcec715965df33ffd158bc8f8cbc0e9f9. 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/QZZ972437138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0de362e15f7debfc00bc4b25023c4d60beb2e0514e21828b415ab95cc4eca3ff. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZZ972437139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a7d3724bb06a6ff60a2e5b4c923aa1709fe253ea14610cd9eeab7b086fea6c9. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QZZ972437141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5a12a5488ab395196b5356e98bb0dc72895649940ef6a01842abfa8e9a444e3. 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/QZZ972437142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42970ce954b43cc047a4e0a20981899441c99323de9cddf1ee55bde06ea46280. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZZ972437143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa205907cbeed417f5f53d6e11bc6f2812847d25cd86e94ad50568947e639227e. 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/QZZ972437144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfd4d899f0e4974352ece11e15800d9da9728fbba177a017fd966905955911dd. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZZ972437145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20b2fb33939e59eea0529ba652646ffd19fd42c959565ff3ccf126f7d7e252a4. Chain 2 (Bitcoin): anchored in block 958617 (2026-07-18T22:07:13Z), 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/QZZ972437146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ac492041980b151f60a31b93147575222c2fbb25bd7ba92c4f855b9937d7e73. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QZZ972437147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0ccf0f4f4dfc6a9c0f68eabf328a4d943ed8e7013c70fb1b8263ce11024b64d. 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/QZZ972437148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe57be53e11394826beda25110c348ab88de2e05019f576973fc1013b34188400. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZZ972437150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4d424ac1bbe1d38f8749cfba8d1a7e6a994cab787c6e2b8badc29c5a50d8678. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/QZZ972437151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e4224d06a44284f6fa004f2db77361cfffa59191976e35360a300d2cb7eea32. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZZ972437152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cd5705f1b819bb368998a0e8d245dbcca9d50337406bca5b003b9dcd05c30b2. 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/QZZ972437154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aa8fae4cbaa05e470ef454ce1f36bd24030e5c3b9ba6107f62816cc9d8fd4d7. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZXLZ2340562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x886d7c9ea1c17ff1cdb90a6355b7f5147d6bd752502667b85edfb337ff020f55. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZZ972480907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5753a36e45981a781353d7dc0900d907f35f13b74b8e871990bc5fc9d549e059. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QZZ972481356.