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 0x51f79ee35734e6efef0abaf3801c6e1fc43c696a73a6370f5f78e04b7b252247. Chain 2 (Bitcoin): anchored in block 954017 (2026-06-16T23:38:33Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/35b381a9-eaef-493b-95ad-bd900bd70c14.json and https://artists.proofprofile.net/proofs/artist/35b381a9-eaef-493b-95ad-bd900bd70c14.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 0xad233ab07c6a66d718851bec187d902c1b601e8b4dcc2c52f9a3cde86bbfe22e. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/BC6M22411936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05f3357e5588277935127d8b7fd04369298c4fd033187a2658ccd70c8219bf55. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZMHL2586452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d5a3f250c427e46ddec463d41d474eaeab8382d747dd9de1d7a7e1e8538baa7. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZMHL2563679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e8fde305a34af9a80b0c041e9ac9ab1670fc58ff292366f394030f6c60e2ccf. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZMHK2541923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4d2a8b88f87aaec0b201fc193d39eb5eaf1b40e6c33d01b0d93e2391d1bfe24. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QZMHP2505606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe4d02de552542c06924d373e5d6e4c0d886e1cd320388c97f0a882f20c8ba44. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZMHK2583914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x461aa345c06c59f981c6e4a9969a2d09b02b5fdcdaa68096d0f64ccd2df5d4ae. 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/QZS632526098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bc38baa39e212f7fbb7eda044ddd83134e6ba6b10a5b676b62d26421333ba37. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/QM42K2545344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ad67af64ca2f37f3abe733a0d2baea048ffb895f3af95e39347272ab95b6954. 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/QZS642572079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x742838b0600f410881b80af6137827818c5d8c24c10e92e6ee6eeb24c81993e2. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZMHK2518299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceff3e2db1e33a2d372562d2f55f109b0430adc331bdd2ab760620dd4d57ef0e. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZS632571640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f6005eb2a2bb9dc7bc48d91bbf5e1a465371995735865b77529f834979ff01a. 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/QZMHK2533576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f5108a27d22beb3f974d76ba53d53ab1cd80a5c9027a21e67a6ea448c50ad9c. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/QZS642572672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c5f9ac5fa9fd98bfadcab07ee17e37410e797aae0ce239d3d4661d0cd880a67. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/QM42K2573293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a66a696dcf178642ad4314fd4b5b42509cc12dde01e78e9abe42a83572f0310. 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/QZMHK2578309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x917e0c5925537e82652d1aaeee4610ba9f2798ccf9fa9d75b0dbd9c090e579f8. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/QZMHK2546053.