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 0x17c75dc67c6037360182420c2fa9e7b559580256f810045ea739a5429450ae67. Chain 2 (Bitcoin): anchored in block 953636 (2026-06-14T13:03:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3621393f-2188-4893-afc5-ad80ed64b9d3.json and https://artists.proofprofile.net/proofs/artist/3621393f-2188-4893-afc5-ad80ed64b9d3.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 0x455d7df6fb1f17cb8294d4a75f69a438bd251380ba6ac12702e7cf7b172f76eb. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/SE6XW2319177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3d011c130e4a0c3b05e0086df0382e6fcd9d50ca27699f057642ddadf1697eb. 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/SE5752447160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1480d22f245829a7b02512736edeb270fe251e1d316037410555750e996e09ce. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/SE5BU2415116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d2e255aa6174c26c5601bbc22ec6535a53c7d53d12678ae9ccb71ce0abbaf4f. 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/SE6HN2440016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x517bddab504659a4eea963eb8d4aef482efafa1b62bd18da1609af20f814224a. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/SE66N2331459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x803f379fa3d71b3809d63a322714f111389198feb8bc35cc9537b24bfff90256. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/SE6XY2305391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2122641f37d5af159d02e24f096dce4fe2ddfcdfeb0489791799c73441ded7b2. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/SE5752311290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22e071e51dfa3d2900e1ba2118905b61648719f57d0120c9687a86f30daf20ff. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZMHK2228989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bc0d58fb03efc9710f1287a60a8f96394181feb1f440d692d10fe88ef700b43. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NLS202200123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x612c09dfdee47926911f35383377fb96ead7de7247fbb5bc96c42048ecd4735b. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/NLS202200109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x704167be4a2288d3d357ef022561c8fa16386fe9e63041f904a0be9bb8d655ac. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/NLS161802886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7319ed132f91cea2ee8f9f0650ef8a18c4087f0cab9013daf3e112f4e6c4302. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/NLS161802802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1494a2bb14d48bf0715c7dcec2f152e5ff261dd80235b3ed7eebd9043f461611. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/NLS161802803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x669c4cdd81fd465d3b3876895cf8051dcf4112e72cddfa89de78749198fa894b. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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/NLS161802804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b8c00e40be8b8f92b807665c78d39c91f191c23a9899d16d5a98fbd2a20a2ac. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NLS161802805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c757ba25381fe15713a56e4ba9c3ab99eda42beacbe7770856d4eabebdb7973. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/NLS161802806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42aef39ac35f00432ed0eb7ecb0fcc41d7f52f9c2d4ce4dd65266f6f01c453dd. 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/NLS161802407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf7b7d8df1c0c0e3b516d64f5f0991194cf2904abb61dde9ee4a42fb945f1ae7. 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/NLS161802408.