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 0xba4bd34d07d9b5fe7077a52f565b7746808e0edbb57433aed507dc86964000e7. Chain 2 (Bitcoin): anchored in block 953645 (2026-06-14T14:31:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3e4c9af8-ed10-4b16-ac82-52dcd7fdd2fa.json and https://artists.proofprofile.net/proofs/artist/3e4c9af8-ed10-4b16-ac82-52dcd7fdd2fa.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0xb1ba5f64c9b3ae782bc6015d8daece6335f321bffb3824980374bfe371620c94. 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/DKPNC9800501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b1e15c1f9fa8c35912dab1d775b71bafd74c8d63535fd5e9c3a3d12b22e6e44. 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/DKPNC9800502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88472f8581bd961681e16f00cbd3478bec44280b48128d6d52c00be476303ee4. 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/DKPNC9800503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbb3ad32e9f76eb616902f775685a7608b5c5cae80e3ee66f9bd1e3f9e33befb. 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/DKPNC9800504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88b6f2ff6317b943edac5725e5632fcb46da879dc41b38189eae164bae1cd029. 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/DKPNC9800505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06689cf4c15134db727e4e8683342c6a4121a31ab82803b637934a5002559567. 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/DKPNC9800506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3da093b377df89ab678cb0ff1c7b2e16618b30dd7bb97d6b104fbf095b9940bb. 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/DKPNC9800507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe372166f4bc4934f8c9538b225d91a64d4648af895f2494d0b30b577f29e9932. 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/DKPNC9800508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39a59a6158f41687f9072709461d40dc9bbbe7e3aed8af861aed8a31be0ef6b5. 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/DKPNC9800509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa698f2306734f2134b395b3caa6a74b27173e549fe3a4ade4108fad211af6f8c. 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/DKPNC9800510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79b870896ac821b6a8e91b3feeffa2c4323494987e103635137e5d3de87789d8. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/DK5C50074994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4b7e6e3bb12e1fb6caa5a360e37d37e8fc1dfb8bf6329803ce01dbb1d818776. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/DK5C50074969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0911cc6a328b4c78a8659d251746b84742572591daf87f44c33dcde9dd6a14a2. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/DK5C50075098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9662f7e4b215c948d3ea1bad65ae14bacb43a0c30da7571c240fbc987bda220. 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/DK5C50075060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ed24d01b3541c3d8d60aa129bb4967371cbe84078f6373b0c82498853678d3b. 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/DK5C50075131.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f177a520a13a2890db5b07b0cc97c9130480ba66cd80c6dd540c435cfe68d27. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/DK5C50075481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8760b4ac77b0cf5ec90d339ebe7938a961364b893a622807d4d699595f86cfbb. 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/DK5C50075054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4188c9e193d7085cb8cb07878339c845666df60af5cf4265a0f12b3816ef9bbe. 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/DK5C50075146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41142104078ff386f7240daa5dafa82c489ecd25e59c408851d2fc23a97171d6. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/DK5C50075000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6bc3572effe83d82738ebebe6fa09c3db09d41afaa3b202ea6e678bf2968edf. 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/DK5C50075102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39dfe342758b0df0b081983afc372a5cff7509c50f2c3ddaa25671ab7dbe6b36. 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/DK5C50075029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x897ff3dd9127dae5687e1be360b290604b3ba88d8ff724a28653296b556d8c21. 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/DK5C50075078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fba40f49b4fb4f8e1d67742c8326281ce817bfe8570e471efcfc0031d556ffa. 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/DK5C50075049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89aa1bf9e1306aad9468a56e8580f5179095032afc319f0b35128263529f2869. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/DK5C50074997.