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 0x62dfae8fa6f29a084ede8c0a332ef31a51dca92889e7fa1c94e6461658b38764. 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/e32405ef-071f-438c-9315-09325b0b25c6.json and https://artists.proofprofile.net/proofs/artist/e32405ef-071f-438c-9315-09325b0b25c6.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 0x35ea3025b91ce0eaad2bfd0734cedb384249c7af63b1b90147e403bbf9620c2b. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T10:12:17Z), 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/USHM81015023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc60e546fe7b76607af840d36efc75be6da5a0cc96de002578366bb0d1cd18d27. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/USHM81015025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x128732cd5d3f62e86123b0e35257cc3ba9f3e07e71d0199780884748513a076f. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/USHM81015026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99912faeca35465ce4389cf55645b401dcc4336974663fd02f02dda48b593e5b. 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/USHM81015028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ed544a3d1baccfa63c1d5b07725a2fb5d8a0280de953f326884415ebdf57ca4. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USHM81015034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc74533715f3fb15235ab813bcfc37e573a9eab0572d598e04c7f264ef25e0f90. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/USHM81015036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb0c7a411fb287bf2e818cde450cdddb8936fb4255059c655973e9bb8b4bbd35. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/USHM81015043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c71fe7e63c0e91b9fb79bcfbc379f2519e2637be7b0ab8bf535edc3b1c1c634. 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/USHM81015049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc715ebc8423a039abccc8188ffc0d7be7de0a3d0b8a68a787347a9de94e8d164. 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/USHM81015050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cda9ef8cd57ba6ea1b9e431638daab1cac9ad626e75ee19359e8e04043eac02. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/USHM81015052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92be18003c73de1d5a519308d44f656b791cdd39802140c4d82190e9d30ec34d. Chain 2 (Bitcoin): anchored in block 958903 (2026-07-20T15:22:45Z), 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/USHM81015053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf37a2513dcac7cff5c9214f7c2f331b27862c42894a84bf603ec6678b0f0cd68. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/USHM81015059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb09610e70ce60b13fcaba9d0f2ee92ea9e3e505b155cd6f81b868d42c16b8a74. 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/USHM81015060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6543bde5401b07cdd21ea5a7a883456e7faeada4370c6349dbcb4cd8ad6e64d. 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/USHM81015061.