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 0x898537aa286041eb2fa3b0aa44f66d65fc6635245719ecb597ab749477c4295a. Chain 2 (Bitcoin): anchored in block 953817 (2026-06-15T18:10:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f73d3438-df54-4a7a-8efe-082fd4374491.json and https://artists.proofprofile.net/proofs/artist/f73d3438-df54-4a7a-8efe-082fd4374491.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 0xaf97f623af7c8c9f11a1c91b776fa17cef3d10f9f50809aa7c304c71299e1f98. 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/QZHN62590109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e0e13f0c159574acff8e5a366758667cce11bf670f17c10dc8a4ebf80f901dd. 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/QZHN62588915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fa483dc38d73abf32fa62f5db8d13ac20400d0b0afab14b9b57c8de0c15e959. 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/QZHN62591931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c36e37e9b28f874a48e3caf31de7fd392f2f41d9b7dba82298a7d03c0c4ba65. 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/QZHN72519935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1eb178d9e5e023b80d834f055a4131702ba5231b502d8b95b4fcd673b6091f7. 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/QZHN62591929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x974b4351fb221ea81ac9f71cd1ecd3409f4cb99d868e3c06ac4f599c77a64072. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZHN72527083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdff8457f9ee281ef500969ea814eb4c6d7302f19bd714b66b33b736ae3321e6c. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/QZHN72529111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacfa57cddd081c8e5dc06595c4bceea56894bf36d848fb02fca3eee91879bc56. 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/QZHN72527056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02dbf5c47e0fcf0c50ca3af8d5cc0e5e1a4a0dd7cb0316a542237717d1dd0df4. 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/QZHN72526979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa38421aa8b70a9fc386f8ff724e2afda4ebb2f4df568b5ffda1ede4cc4e71e51. 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/QZHN72526945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38ecfc81b0ca015a5c3ff75371e6419c3bc895f2ad685f649611abe920d48cbe. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QZHN82534874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1e7fd79fb986d17f5a54b186cf773b3beb47d8a996bb9d88a25efd3a6083985. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZHN82533851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ebbcb290ba7fb929743c37a709414b327b6d088b46782302de408ac205f8319. 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/QZHN82534870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a1bb5209ed270beb83ea8ec80d65692f49e0cae4d1ec8fb1e1e543b2fae6aa9. 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/QZHN82534856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92d75efb01d1e8b4fe07539aefcbb77dfbcf99dfccfcfed406914883d6cad878. Chain 2 (Bitcoin): anchored in block 958863 (2026-07-20T10:27:46Z), 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/QZHN82534847.