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 0x67dd6ea8e2100989183e76bb755bf887babe8464f8ce9e9bc41c6d0e7281d23f. 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/af9c836b-a889-482a-aaf7-3ff588077c03.json and https://artists.proofprofile.net/proofs/artist/af9c836b-a889-482a-aaf7-3ff588077c03.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 0x859c5fd242f9255b62e772a7763dc9999ab0d1741c53fadafd8f385e50f5adb9. 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/DEAR42192965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d9cb6a910a44fd9157d96b9b920f2d5ec7e1a36e0213599b3292238259dd0d1. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/DEAR42177534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x989d9c16e7eb6b7a5ead45db250b4846d4a5269fbb75fe832d58e567d5c176e1. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/DEAR42135739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40f546f430eba6b7619fba045ff1576adf862a5065f6e1863cbed2c838008abd. Chain 2 (Bitcoin): anchored in block 958666 (2026-07-19T05:00:30Z), 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/DEAR42155684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76638f5791e8dfbb8d446f12bb1015066d21ca850d541a4cc06dda934cac6851. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/DEAR42128746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f92dfc11cdf7b6b5c8f062a73ca34720c9ab3ef86f66806ba8f40ece2b17746. Chain 2 (Bitcoin): anchored in block 958682 (2026-07-19T06:17:12Z), 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/DEAR42124043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1b02793967ec8c43f184c2380d253b7283d13db6d5405701c6123d5b2a40736. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/DEAR42260752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4724c4e9239ed5652a38882ea5fa9d6452ed77c1c25c6340c8b2ec07386554ff. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/SE6XX2235024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37d9a78b651589722c44834a736e714725a99a18f6911ff0e00b86d810fce23b. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/SE6XX2235025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7405ca8907ab9cf59e02e251f9b0910d7dec06d1af96c223d4d4b02883e81803. 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/SE6QE2324391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6f215e9b10c58e434271d22e86d04cb872e864efd2bef08b911c01558301d89. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZPJ32320052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0622f3e59c970dfed4fb94a509d2fe272752549625ae8217ad28d822b6d8902. 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/QZPJ32337662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2e8e76d5f4580f88a934c1295cd8f0de7d2530557a749ea57b44bb32045453c. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZPJ32337664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x942cc9405af4e9b061a2339bcc37ba0339321653740ad958ac96010818b17594. 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/DEAR42481635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf34f1a5c73ddc33db00f7e529cc95ec6abe6b3fdff4a41fff32f81360cc41f88. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/DEAR42563620.