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 0x73d643ffb92259f4f98d1fbfecdc2438f3a771a4d0ef7b0398e4c7257cd532a6. Chain 2 (Bitcoin): anchored in block 954569 (2026-06-20T14:36:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b34b4d3b-b046-4a9b-a902-7e6f84d82575.json and https://artists.proofprofile.net/proofs/artist/b34b4d3b-b046-4a9b-a902-7e6f84d82575.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 0x61f8289fcead2397e4bb76a77f5b2aa159f8b1c1e23373d226505c92c02f6e09. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/USA560638260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c076bd14228ed7bd1a1fe58369ee8991b5b1aaa4f8da2404a73d4e914444c79. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/USA560638267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09ac7cff54f8fbea17befcf9bbded82eb67fc9c8df24b782e63521419ec9217d. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/TCACL1680073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f9a27c16879f9ed5cb7f30883cf138d971a89f816c5630f458fc68110d5b8e3. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/TCACL1680074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe36dd78c9ff2dd38b4a7aa537a632f534a024398d07d3dd514fdd8eb94f640d3. 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/TCACL1680076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef2bfc9429752ff57a8bff7afb8435975f25e5d4a145e57faab7a0661af6f320. 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/TCACL1680077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2c9deafafc56335c548f95b04ad5d5622f658a9721fbe93ecd0196ff5c2e0d4. 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/TCACL1680078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07a6c1f32ff1d70a2d0518320f5d6b0c43d1bb0d09bc0116c5acfd5ffd05eb74. Chain 2 (Bitcoin): anchored in block 960173 (2026-07-30T00:11:40Z), 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/TCACL1680080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedaab1143d5dcf75d21575798344a841e3752a7a97ea7b24298e454d003f2621. 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/TCACL1680082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef8a7fdca24cc0815821a475f15c0fffed191383e9b143d9a65b0b515dc47cef. 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/TCACL1680083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac9ccadc6581dfd8cf1bef92c5e3f223f3a02444649de451a5f048f24ee50b68. Chain 2 (Bitcoin): anchored in block 957025 (2026-07-07T10:59:31Z), 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/USA560638234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5086d88af9682890668d9817a0e6e80e2994f3fe2e2355a88f72cea47378ca4f. 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/USA560638235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf159d0d83ec35ae900f9d33aa7d602bdc0ffb76090ff56d819956d69a4cb36d. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/USA560638236.