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 0xf78a2b5eb03049dc986e9d39b00bfe2e494ac801b57fd15a9a0f50bd59f2bf39. Chain 2 (Bitcoin): anchored in block 954638 (2026-06-21T03:45:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d3f30a85-bd66-4bda-a2d5-cde46f442411.json and https://artists.proofprofile.net/proofs/artist/d3f30a85-bd66-4bda-a2d5-cde46f442411.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 0x11dac86777d3ea9e3ca74b13c384147a73fe703fea8a7858b9c4ec9a223865d3. 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/QZK6J2138827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd06ec82702520547727d20e3522c8c136aa1873d273ce2605bad9ac734db2018. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZTAU2264820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ea45ab294d2577375c01e0fd7b03fd6973e3c2fb6cfb4b5b977a7dc312d46a7. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZTB62267787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x898f13dee5f26b8de941c96ab5077bfea754fe6fc3f04ab927b54cb926ceab52. Chain 2 (Bitcoin): anchored in block 959026 (2026-07-21T15:38:13Z), 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/QZTB62267788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5f179b1971d3cb435b725243f14a82a14b2e049d68306b3903bbe1943fa1868. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/QZTB62267794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8aaf507e6aa7054cf74c18e503a3ff7c8890683da4de49f82d6d7c8c489d3688. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/QZFZ62417043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c24680437205cbeb32903127c24c17790a75680ee2dac320b51fbecab89edf0. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/QZDA72479322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x697b7e221a1531d8da73d78d3929ce26352d23862064ad8e55b0fa0b0c7939bb. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZDA52531441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b80d610b72e706541d04864bc10ab9b57a057f4be75f2a780970ee39768af0b. 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/QZDA52531445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a216cdeba5b5e21a1088846866311223c8e99967af287a855d304747cdab79a. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZHNA2561842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b8ebacfd04617b949b7e36e2d2404c4a8da52597c32b84c87f3460e3b08bb80. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/QZK6P2523729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb70a493e1044c87bf192b68cadec210d03f99e332bde1150bc0268d33afe0386. 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/QZK6G2521379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92b6c9edfe8fe2658bed0799fede766af24d5a4d20507d6acde9e7257bc16ebf. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZNWS2598904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35da3295fe180dce2ff283ef786234c4edbac321b43e82a1a537d764593e588b. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/QZNWX2594613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde918561123599e158eebfec7a3241cc017f9afda93211e3c0a0487f2947315e. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/QZRP52576927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb05825b7b65ff34bd34477c93dc551a7f4c05889e30dabb51ea668b1a2e16428. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZTAT2518714.