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 0x23d07c77bbd7d3a2401dccea23224b2f3394d26cc08a3cdfe4f1ba4f3de14c18. 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/da1a50aa-ff9b-4191-a6a5-4b1de33125c3.json and https://artists.proofprofile.net/proofs/artist/da1a50aa-ff9b-4191-a6a5-4b1de33125c3.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 0x4171dac9b127b5883812d1504c237315178be43d047354736a4d269de65a9512. Chain 2 (Bitcoin): anchored in block 957744 (2026-07-12T19:15:44Z), 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/US9NM1800003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd10e0a9e3f419943286ab3543811ce6b38e86575ffb9d63e4c1c477b2d335a9. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/US9NM1900003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c84faeb4a9d0eeacaf3b763369ef2e9b880c5354ee0106a1a5d2ff56e0769fc. 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/US9NM2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a73f5e649140f0d2627573144f011e2f304859c859a7d6a1e4f32d01285d38f. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/US9NM2100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33cfda609b30f39e060631d82cd5cc8ba82d4ffbfe3ae878913a2cf4405ac47e. Chain 2 (Bitcoin): anchored in block 958602 (2026-07-18T19:28:16Z), 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/US9NM2100009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x242672aa3bd45553c20b53083e7e5e03d374b67f80bd36cd051dc662f09b0386. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/US9NM2100010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3e337578f94f4be1cc2eeb2955d3e9234c430cd1cf4bbe306332e2c03b3cdbb. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/US9NM2200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5af7d00932f52e8a764ab7727aad2d01e0363fc2a164ffc11fb265dabeb73ba0. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/US9NM2200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41d017a4a021a38b66fff05e18fce1b7c4c6eddd781b4ebf51dc46b5e251afe9. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/TCAHM2368925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc597ce63e3980a5d448daaba7504bced09ea856790ee17952520f903e070e13c. 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/USLZJ2487542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x610479d621743ee0374e19459f2b7890dddcb9ba35d2b73959e3698d31a04ae4. 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/QZNMT2445300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x312e39d9b069f152474802bc3163e3bbe08fd06613d79f1da73e474c485a8d14. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QZNMW2411592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52593aac0e7c99c183b670fd8c03da17eba6fc680d79849b0397c41185bcac8c. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/QZMWW2477744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d79e2a220906cc16fd47488fea96408f2eeb70b80cea4d54a7ed293e57ebd95. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/QZNMU2460723.