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 0x5ef558754fe6b00e54117da6c8a7c0628f0de7a1d6ba3380dac5cfdf90dba160. 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/e31f630a-f0a9-4d46-89e6-5424ebdcb883.json and https://artists.proofprofile.net/proofs/artist/e31f630a-f0a9-4d46-89e6-5424ebdcb883.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 0xd8545a728d55f0ec405dd633827fb57986907e8cd7807daef966d3892d8d8613. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/TCADA1735458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbecbb291791ed6ca24dafd4ea53c6223e62b71c164c52e2275ec66f7f5a1a41b. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/USHM91921357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0d1320b3b45a1369c2b1792a27b77220bfb646981fb8dd1c17437403195ae6e. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/FR26V2031052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34d0b51ad4af6146970546b030636654314d43d2a172197f862ce2fcc8941233. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/FR26V2030729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb634dc9048fb084a341bcdbbf1123848bed6f6da5954e2bf2a94482c0def9c65. Chain 2 (Bitcoin): anchored in block 957866 (2026-07-13T14:54:25Z), 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/USCGJ1969149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdd8bf818ab4c5a64f1fa5d1ecbd1e3f71f29bfb73abebc4c70f2aa32742f625. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/USCGJ1969152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f34afd1816b92cebadbec7b1cb98d53e1ddb86adb592601c09f8936cb1cec37. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/USCGJ1969153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02ccff359d3aabba711e6bc0de0d33b1a46eab8ce78d0088cd247317e0788c2d. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/FR26V2030756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb186e9d31f8dda13f5f2707ee151cbf8f821c895cef14c0b42b0c701a45d9df9. Chain 2 (Bitcoin): anchored in block 957866 (2026-07-13T14:54:25Z), 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/BGA742100874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e04ee7394a3dfd9a5485dcfc9231b5eef2458b05c0987eb40b306ff576757ad. 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/FR10S2281098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb47453d3f92a16fe7ef045c1aef546496423edf61697b8a4bc9e59b8cf6e76d2. 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/RSA222091546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab1c1b3005078af8e4b043f49871ef5cbe91ec36c54cbb0d2603634430ac5e19. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/RSA222091652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe7a71bf8b89a8b6abad904fe666ba695aa508af607541491dd134ac57e92049. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/RSA222091727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3cff5cd741801f62beaaaf12a2b2a648e018ef1ec030ed39fe54031e1560f46. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/RSA222314240.