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 0x09d8484cd0b1d6aa682953a4058e4e95b91c9daf7c251f1556be22ab5de41763. Chain 2 (Bitcoin): anchored in block 953996 (2026-06-16T20:04:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/30f0eca9-6e4d-440d-a9f6-89fb018cfb36.json and https://artists.proofprofile.net/proofs/artist/30f0eca9-6e4d-440d-a9f6-89fb018cfb36.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 0x52d7c6a89f9451790197e06764f39dfcb00a30376c8c65cb42cc61904153314b. 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/AEA3A2075305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaab3eff15d688e5fa47a166a8c1e3547f8a094d756b405029f834cbc8460a3be. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/AEA3A2035404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabd793069b020d677991da038d4f087a4af86d5f630d4637763965ff85d15fd7. 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/AEA3A2047941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefe7728e2064b3380a5c1d77180e48b26251ef91d9d9bd415aa4e03460839c9d. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/AEA3A2099969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d758638d3544761e11eccbb4053a5f697323c3fb7570d6217ccb7845a487462. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/AEA3A2055906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01f33a839d64b4fb143cac6c657a23df8d4408ae6f100cd66b23595a6b9cc9de. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/AEA3A2003354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb38dc43cf26853356bbb275326f4d7da52f088af2393bde8fb78bcfed638eb0. 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/AEA3A2083651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d6c4a64f750d75c47d31ad196de65d2cbce6642102e290e8b5b3b3f75131a83. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/AEA3A2039925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ef08f34906fde28f4c4782fcbcc2c25ef3ba7dd96714e21b4c04caec0723a7c. 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/AEA3A2054984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd1727befacfd439fdc5b17cbf4098ac59ad83340c5613ff92b73c4dde0bf172. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/AEA3A2032903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64565259190e1cd5f2587e13a3878995f9630673a7dd423776dc32f678533a57. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/AEA3A2004912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0c4b54ff99bdad78fcf456c22afaeb6dbbe8689a780561b95a1bb6b5a356567. 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/AEA3A2066131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf23dfa5ac95160d1443e62b98035492fd43688db9314346f0d2b1249829ec80. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/AEA3A2065741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc542b9a5b101e7a79135c1062a4af696b4e3d5fc6385dbd9fc0f11ac96816ae2. 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/AEA3A2010767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32af3f37b8ec82ce6b22ca269a51cf495532d04ddcb647da7f48427854f42a75. Chain 2 (Bitcoin): anchored in block 958830 (2026-07-20T05:30:12Z), 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/AEA3A2048133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe62f6b1c0b54663e49a1066bd6b1e2360eaef213deb4d2ac14913966606d2550. 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/AEA3A2042545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b552191d48db42ae1a818055523407a2521a0114d925307a272f2971e598ec4. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/AEA3A2072152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd49eb8caa0f2ad840d747ac9cfe6e6af3b992c67c723acedc9e67dd0bf3db572. Chain 2 (Bitcoin): anchored in block 958819 (2026-07-20T04:08:24Z), 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/AEA3A2054001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5a355dc091b3d2fdfbaf0845da2f35bf4994f2ef67d5bafea3593cf78fe1355. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/AEA3A2084571.