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 0xe4216d46631d5658bc6f5312347592fb1e36e3bdb3bccf63f0973265189b38da. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/db3ed640-fa4f-487c-b8dc-3fe3b8bc7606.json and https://artists.proofprofile.net/proofs/artist/db3ed640-fa4f-487c-b8dc-3fe3b8bc7606.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 0x88fb4801afb9aa6b5948236f5bb1d38cae64e53fb71e9b292dfb9d1a6f1763a5. 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/BK2242400495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52b91af87c131590309c0f0bcb6b7f1fd9dea4fb904850cd77fb1d5a49fa3d32. 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/BK2242400647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e34740cc2097c9cd44351e58d160c1aec908b4dcf4ef4422a7b66fef4241972. 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/BK2242400648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa75aafcfbc4cbbcb099ea4b95ed81335c4e5755fe171e2eee7f0a8e09d5cf878. 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/BK2242400649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa87517aa88c67b22a9fdefa56af55e6abf65cbfeb07f977f0b374651e739214c. 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/BK2242400650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92222a37657c1b63dfda2f81faedd723f06e48752670d3cf96c5bb3ed902710c. 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/BK2242400651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd73880d76f4bc5789fd928284e3a5491d686a7b2a85e90f8bf739c5ca6e5b298. 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/BK2242400652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb229d2334be2fe496b6ca9d511d6d38513a174c5a4a5cad19f5a5b6fea3a73fc. 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/BK2242400653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x457114676818eea1d72ce76d6a2c55a83f8fa7cd432fb442566a7b9d0827adb3. 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/BK2242400654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ae7aadaa84d5e16521120e90057db9216f4bbcef20c397eb48edeedb9b8bae3. 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/BK2242400655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eb0af662027d6a325a7e1f1d2729bb927cccbc303abb0abf12b88c387707f37. 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/BK2242400656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4279aa15728c47e1167bf1dc5b276782d1b3a9b72b86dfafacab90eb0ab8f09a. 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/BK2242400657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd69e5feeab4ab03a615367e6886d71c354daac480b476c1318cb5b7efc383514. 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/BK2242400658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x198cced428fdf4cc016e20b073f39d55a5ad79a9160e1bc1832593c21e8010cf. 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/BK2242400659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3e440079b61d69e9648ff3689894c9c96e5bde3de61f56197ca773905e254d5. 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/BK2242400660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae71d0d5bb63ae9747f494cbedda8ae2b4b9ad86b967fe79065eaf6472ee81bd. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/BK2242400740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb67853bd16ce7c1f790ba958861141ffbf63a72a4b4542873000cdb7aac9d912. 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/BK2242400741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5d5394f0324450963d97701ff3de2eae668585f1aae1bf9be2f7107a66887e0. 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/BK2242400742.