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 0xe1b792f894fc7e9b2ae247441a48b7b4264900dc71b2d260d077759d01bccfeb. 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/d6b2e469-c647-403e-8ff8-b846e940f272.json and https://artists.proofprofile.net/proofs/artist/d6b2e469-c647-403e-8ff8-b846e940f272.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 0x80a4f792bcef851536eecf8ef21a38bf03462af5d2e267d9c66f2d8717938973. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZMHP2093033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04b372600c4b76c3c7f339deace868b47df365ce86149650cb048905b500d743. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/GXBDT2312995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42ee609f064244eac6c3beaedf20ce5f66d1903bd7a47202254698bc83232947. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QZMHK2058604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64afa3e3a779a4ce5de280ba1a33178fc4cf3aceb3fa3bde79dd902418551918. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZS672118375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b7051415bd1ff4c92565951f2101089624ac0bdb3a1b7cc2d56d4fc50db00d8. Chain 2 (Bitcoin): anchored in block 958462 (2026-07-17T23:17:53Z), 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/QZS642193162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x277992410e5392501201e302cf70d34b478893dd4bc525d32e8184ea9d206657. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/GX3HH2217211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf6e03b140a2881267579b8fbfee41e778ca5546b05059c2e3413a96087a48e1. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/GBSMU0122457.
Leave No Man Behind (From "Black Hawk Down")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f0f4ff9ea03dfb8dfa50c438a0680b7e0c1feca95778a3c7e7c6f1e55612d26. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/QZPJ32213596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70d7b56e4f3b903d2f96041733f723f89dd7e095a391b291155c7de9cd8c9fbf. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/GX8LE2213842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50fcea884b43cf72b3c6cb2ad598bbc3d79b4e9e63de104da7dee0021cd9664f. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/AUMEV2303512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x061d934d087491f5f4eac2c2aa1356c0eb4d119d378e7c04225e1578ef25d23b. 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/GX3HH2310360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48665f41701ad3a91c65763094bd805b7f1fa9b929b40e160104d55c5ccfcb4b. 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/QZWDE2313383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf37fba4a7a3fb68361770eddc292134ba6185f589db6d94e3d209dd078936bfd. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/QZPJ32321011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04490324e7f9ac51e0e3634e67b8a25608e8ae6594a355711f361efb95c58920. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/GBWUL2456623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4c9b05720d27875c411bc15bdf63b9eefe165a4657fbd5cbede22496b92c651. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZWV32442156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c025802938b41f899264ac7ac7f886b1b95350ddd92dbb5c588a334a6f63273. Chain 2 (Bitcoin): anchored in block 958529 (2026-07-18T09:21:41Z), 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/QZWV32474261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72301969f59f1e96c302526959a649254db1d8867ab82dca1b27a4e2e61100e8. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/GXESV2475299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56ddf7f56fe6cf2bd400281e8d4e35352df420d8ee50b20133c5195e9acee588. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/QZZEB2493490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a69bf7fdfe44b34c1ed1a212247f49ea22ee56353ce833e7f2c6f0b3268c05a. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QZWV32531107.