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 0xca0f2aa5ddc6b2a1f818c38c0375e73dfb0d01c0111efb343736d7e180ee089e. 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/6cf7e5ae-d34e-464f-aea3-78c141c2d413.json and https://artists.proofprofile.net/proofs/artist/6cf7e5ae-d34e-464f-aea3-78c141c2d413.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 0x592da5618592198d65a094b53a33c7d6b9c40633870b9652dd93b3f0237b0f6f. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FR9W12225479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x702968ae13879b8d84266608e4da0ff15dd83d03951c0e2021c432d71112f312. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FR9W12225480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc89524133407ea2ca0a5d3eec95f12b894a8f56063d024dd744433eada4f9386. 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/FR9W12226938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fc4fd5af2d8aab0056556d20fad7d5bff6270bf314abd284c9f6a8f741637dc. 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/FR9W12225482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc82e0a276fa94b0dade112e2bd1129cb73b6af1cf32caac8f97a162ed174f0c4. 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/FR9W12225483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5562969986ed9eba9ad3cf8eda15659c421adfe75552a772d88bb6983f92a6f5. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/FR9W12225484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9f7405949e56ec0e3347772c56f0081b771f8badf15aec998f5a931dfb71ceb. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/FR9W12225485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16b2d03486f0e14b0077343eaab70d60218d765db4bf93c5f0657c8355f48911. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FR9W12226937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb419f6c8b08730f8ce31e1cab133cd645851342db371dd694eb61dfe64975c9f. 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/FR9W12225487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfff4f7ee101b057bd757c70dca799960b518748994407f6a4c29bb6fa1301d4. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/FR9W12225488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc470f6fde71cea7197d731bfcd0f7c1b59eeb71489ee7d5fa32d2db75e141723. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/FR9W12225489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ad8a1fc0b8168d5ccda02ce6149ece10b3469a07e05a7eacc35cd9e165566ce. 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/FR9W12225490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x587464f1f2d1660a3cc5ba32a7e1ba9f527df07d2ffff7a422cdbddee97073c5. 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/FR9W12225491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd809c98fb84dad8a086c017460e47c5522f7c86a3ad2a418dbe7fee710dfecfb. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/FR9W12225492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa149fdf5b175d1724259ad682b4a9129f7739b328adf99424a606be5fd83fe31. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/FR9W12225493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a900ce12715d08758b4581e4d5148c6eb5c9cb6f9d25d22dd659a5529771b43. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/FR9W12225494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b9eb961fce2e4bffd2c0e332b97364c1802420dc6be7dcc50e8127ce17605bb. 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/FR9W12466546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x930f5377745e6a6e68911aea76bda221a40ba02f29654c82ae77e23ea19bb422. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/FR9W12466550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42c1816a3adc55d2c7b6ab5609a4d323e60121f91b25efeacc059641ff2de3ba. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/FR9W12466552.