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 0xce18f2f621b98ce6771fc63a34bff786c08d7dcec9777a80f32f4e6eae1d744e. Chain 2 (Bitcoin): anchored in block 953791 (2026-06-15T13:40:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/de53d45a-e5fe-4a67-a361-f0d60a4953ed.json and https://artists.proofprofile.net/proofs/artist/de53d45a-e5fe-4a67-a361-f0d60a4953ed.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 0xac672a59ae9227eb7fd628af0e7bd7862563cfbb55808405b1ea6de086dda21a. 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/QMBZ92336572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34c8f54351346b29b03f6f2ce10d5c05d4f3530fa582150f484b3d95756dde83. 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/QMBZ92336573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x261937993c5d78c2aeaaad10a77574892352afe7e9c21dc20ef8b1583389c32c. 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/QMBZ92336574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5450f0850d97455112489a79af647f25d75b748d12dabafd1cae040e9b60fba2. 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/QMBZ92336575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9d9d5031ce4782482ffc24ad3df55bfa26085479a7ccd3fd4fe444a2598bda2. 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/QMBZ92336576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe08d47ea46d88d841a41a5e0fad85606ac5923067921f74b7bd446dba5914098. 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/QMBZ92336577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4962c864739f9b86df95616c04221a8e1118a6be0d8fe245067e70177769cafa. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/QMBZ92336578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a1615965da68ecb392d6d11df2c6ce58f4540c96bb6d729ffb065b851ad4ec4. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/DEAR42271328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda370b0725579d2ec84cfa1bb07bb6ad445f99b7b899007fffbc299ba6f3cdf0. 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/QM4TW2127377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c1543e0a485f7e36b2187e1b9509504e10731b716454bdb82891e8ced616988. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DEAR42240574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa15629191784025665ee31bab1755cf5645f033287a5bab318346a4123f7b0f6. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/DEAR42287163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03b745b1b5426695dba4f165f4c98c3cb43e77f8ab46f50065a5adb3e2320f86. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/QMFME2027557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa281298a9892d6e3e7bba5a74adf93fa48dc3b8888d077db8747f83875868f44. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DEAR42256744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcf0da4602c28bb1c648b8b8fccfdbe9b19821f35fdc7bbe814821fb7d097efb. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/QZES92073461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e8c28d927f171c7bfe20499813124507091c0aba6e26abb869d0add8ce4ddab. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/QZES92073462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93f274a35d9b13b8400eacddc78e21834a2e5d3c73931f80cd01a072d76449b0. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/QZES92073463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x261937993c5d78c2aeaaad10a77574892352afe7e9c21dc20ef8b1583389c32c. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QMBZ92336574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda370b0725579d2ec84cfa1bb07bb6ad445f99b7b899007fffbc299ba6f3cdf0. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QM4TW2127377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03b745b1b5426695dba4f165f4c98c3cb43e77f8ab46f50065a5adb3e2320f86. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QMFME2027557.