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 0x367de6c29579b9e5cc1d34af5e4de1fe6b9aaf260e83a65aed78bfb1c14eb0a7. 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/0f329215-e9c0-43c9-945e-9a42f20b232e.json and https://artists.proofprofile.net/proofs/artist/0f329215-e9c0-43c9-945e-9a42f20b232e.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 0xd07b6a4de8baac30abb22e24e0036b94afc8a3b02045fc461028907dba60e438. Chain 2 (Bitcoin): anchored in block 958122 (2026-07-15T11:01:17Z), 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/QZNWY2050612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b9892d6cfd32091aaf4e7bee8867ef14f6152f4a9e3582b7d411c9dff85177f. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/QZFZ62114459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x494b459eed8f891723950608e9eb0cb55b3babe3d9f8f253815a20ec98a745bd. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T23:32:15Z), 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/QZK6P2117739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x528463319ab3730b7eb429f226872a2f1a0aaa0d8ca40cd0e154fc32c942714a. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/TCAFT2145480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x805b1afa86800cd777debf7f86f306c949ab1ab807aed81cbcbe730b28ea9cef. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZTAU2116404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x685d5dde9fe6208640166786510404bc3f1372447a186443d490b73a8db7490e. Chain 2 (Bitcoin): anchored in block 957599 (2026-07-11T19:42:17Z), 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/QZDA42294646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x718c8dfb6aa18809217686cd41483d9820c9e120885ad0855e7b8a6690e61aac. Chain 2 (Bitcoin): anchored in block 957599 (2026-07-11T19:42:17Z), 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/QZHN32225512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2e2513a29367c497381a4302195864df99e250316c06b1cfd94fd103536fa43. 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/QZK6Q2292942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13442da3d0b560f5e2aeef2a0ef872ca79887d957f068f38e146bf2efc7841ca. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/QZMEM2286318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52c3bd20f84bf1f8c1883ddd5b0c13ed17fe3bf12c59a7f702bb6f6344bd669c. 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/QZTAT2267137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce383d073a8e60bcec476586ceb1b5efaee7e88056b026ed331c0afbca08c551. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZTAZ2239227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1569be470676d7b016aaaf384b06910fceea94d49f81c181d133d1616852e06. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZES52374695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddee6dc80e643c09a8e26d0f1865d12ca995790aff52f7c60ea1396c60929063. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/DGA092313316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d660378a9e89a827fa5d0df732103f9e6a53f8049b79ae3855deeb48f4a087f. 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/DGA092313313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43d2250b2f09e57f1b977682fbc33fc6cbeb1290e63305cf1c4d51a7b6f5dcf7. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/DGA092313312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5c58fc8fc2749a89e50b15e92ce9ab6b3ee39de16ed1e6b50350436b5df0b0b. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZK6N2491777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee04b4ca790ddaaa45743e8a3a50de0479ca874c8b3820f9776bfe2f5237e9e6. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T07:44:31Z), 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/QZWFW2417658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a6e4d7512be2f7bb5f58032c1118e2353a6b1f77b50021688339bd166f1ac6a. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZFZ22500964.