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 0xfa2529643f25cb4a2a9e8137687e865502127b55f528971a66a709725358a04c. 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/d44cfee4-8dce-4acf-a535-28fd3ed4f2bf.json and https://artists.proofprofile.net/proofs/artist/d44cfee4-8dce-4acf-a535-28fd3ed4f2bf.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 0xcc739a8a80d6c6a1259d63a8f25395505b46185edb5b06f355ed0581db4100f0. 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/QZHZ42128205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8aa5026ea5615f1ccd36632bf2a9c3693c92c64936c0a5d25d9399c0a541d04a. 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/QZHZ42128210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa673c1a1bb563c84b89784feced00ab22d2749b8627f90480f3b87acc3b3aa5. 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/QZHZ42128206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e28f9f8baa6e723c83d243fb276d6cdfccd8f328249989886f8f3f84a3ffd88. 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/QZHZ42128211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55338642d4c98ef11d3c50db46a9c3fd0c438281cc1b62fb9d362cc061f4970c. 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/QZHZ42128207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5767d926d6d388ada3fd02fb8db3c9114c12460c77700fbfd6878727c4926c7c. 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/QZHZ42128208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6c09eee7cf8059ae48c778fc7c81dc10da97633e62a0b8f6d7e6fa310124b66. 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/QZHZ42128209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9946b793daf6cb9d8c5fdef82acd7e95a651e1df44998052b1a93b46d4751af. 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/QZ5FN2261166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbadfc3f6723dccfcde5f136a41c9c6df89e896ffd6f94a72e6054ff369b89336. 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/BC9PK2300073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e5028e28c95dd208562c8395bdfffc4b444f9109a0ae99de13063a0f64df73d. 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/BC9PK2300062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0917f6454bdf1ec1308c45b029fd9f412793ae30deb112e68430a9bb994e244. 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/BC9PK2200041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x850b11b78a02d4ffb94a4c2b3486902f4c6871a204a0eee23a56c48a46abebb2. 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/BC9PK2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fa351816dabf282318a6b2b6810d31bc4312e8652eaec31ed8b78500e5278dd. 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/QZTPX2257893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc43fab5cfe39dfde5275656a9da0ab8043819440729503d8ee642c53310b4dbc. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/BX9L12100171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x624851c69abf1a02a16a4545769686760737edf38311a9f8d070bc9924e3574f. 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/QZNJZ2487704.