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 0xaf07ab9adb28fec53cdb2a819ca9bd9a740d2145d2e34f45a16a72c502657bd0. 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/b7c166ba-e1fb-44aa-b604-f4e5c28aa7ed.json and https://artists.proofprofile.net/proofs/artist/b7c166ba-e1fb-44aa-b604-f4e5c28aa7ed.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 0xe205440a9659d97426de3ef669a5baa7506656b9d9eef231a320ad9ff7dd5d26. 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/TCACK1533869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf08c72094f73dad6dd808c7f2d46998e7916ac2177e2f57f227b5055eb6c352a. 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/TCACK1533873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a855a701174c83d1009f8e84fdb050aa0af5dad3983152102f34ff8c7cf960d. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/BEP011910004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96afb96eea372078133df736f30d9da4dff966c9c2667e4ab692c36a1a2e9e64. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T19:10:51Z), 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/BEP012010002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a4e02ead1b91f85f5a7086d67cdaa2d38160c88755659659f80fc77ee71209c. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/BEP012010003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72d3058f9e717e3397cc320568a387c79b6d11236fe60ae86d95a40aa9d9e441. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/BEP011910003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcde5e7c9d77886acb69e6f9e30aec40fb8240caa314fd69fd9663854d5dfd842. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/BEP012302004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56fd943f878bfed07a7723e4a29ca89d4ef7df777146a752f753f4f9a4de6878. Chain 2 (Bitcoin): anchored in block 958130 (2026-07-15T11:23:40Z), 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/BEP012302005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ab036b74938b5f41aa6eb2131572215653cf39185c4e3afe413e5074aa5cc06. 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/BEP012302006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4238d0a7cbeb4f2eafaa5e91e8fb3fd8a06af301b2e1982ef314a910672f8598. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/BEP012302007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f4e31928308966e24d7b00d3296ff5e2bb3f26dfdbbd97949f232bece4d4b99. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/BEP012302009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd7b4a71b94312c22b1d37b3e3d94ab29eff1892f19aef611cf9a3248f73fb13. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/BEP012211002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeee7c40b1da638a9fb499ff002bc616a6913cd589f890e082ba209444fb33420. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/BEP012302011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9fca05cd750ba06ed2b8cb1c773fdafa786f092f33443bfb1da7fa7afa4e86d. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/BEP012302012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6d3dc22a26152f1fe8cf21382d79a38df213cc2fed1767aa031de1a62ab311c. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/BED482400301.