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 0x32cfb7ecf7d582670088071dc2e5c6c8bab6a034ff313e41318d4c12ddb90f73. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d8bfdacd-7bf1-489b-9772-c2d3f0b60c66.json and https://artists.proofprofile.net/proofs/artist/d8bfdacd-7bf1-489b-9772-c2d3f0b60c66.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 0x79bb8592f16f3911f068d591957102c1f7e4c37689ba6b8771f98d95c1457f64. 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/QZHN62372722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed07b57e0745204ec6ac468d13c59f631cee1c67c090545956f014ef03706a95. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZES72233091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3402957c4ca472e59311673ab30aa04fe1046cc70b14dfcfacd3df8846d91717. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZES72234041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdc4ae6c5d4ab3e08da25569c2be0cd87774c2e2057649975820b2420495d2ca. 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/QZES62217957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49c3b0b917640e27c56fa6c01c47198052dfb009661f55061e5d2f07dc326d51. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/QZES52265211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6b1132c3406ea45358478881c058b6eeedcb792122e95d81badc879424c5b3b. 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/QZES62258174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x255d49cb126a7e66a04e79e19219261f2af53b156b34f560dc5e313422802f3b. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/QZES82217290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc973ac2e96db9bb2fd85cb1672a1ec513cb5270ea127be20bb0a43f89c41ff5. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/QZK6M2459099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ff26ae5ca692a3dea3f90149b8cc883ca46ebfb6941062b83d13336f0579703. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZTB62477163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafcbcf745be90d3be55d45a39d1d6afdf4193b4031ff54a52be2fe712d78398c. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T02:14:33Z), 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/QZTB92410663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c103bb9eac477c3fed477fcba4f5420db5fe9faa4b3db76388c7f1425219c1e. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZTB82496606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x875fdcd543bdf0b77ed315b7d345ae1438869dec0dd299e437da3a97164c8375. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/QZTB92427574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa66c298ae6d6b2ef6643e286303f096de5a732a62c9ea90698fdd539dfc64f8c. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/QZTB92440025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ce9b3ca798b1c2fcdf663488dc4d1bd038462a9cf26a76ec452bc56600afbd5. 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/QZTBA2437606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9622359a9ff7ebca6439aaf961f564ad1c4594960931e3ca0c39751965197282. 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/QZK6P2545931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79cd748bba742f3afaf7cb0568a85de45494a1fbcfb932de62ae97b71f38c95c. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/QZK6G2523819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x224169559a06c7a99ac2df6708045f9a9bd118c6934b89e370842f1f52c2dd69. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QT3FE2550767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f74cbab01609e407d7c0b28f6b9173b844b39b11a15893853bb954e930264bd. 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/QT3FD2589589.