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 0xb860b2885f36f0ee435db66739f95a5fdd4bdf936a8be625bfc2c9afbc3ce560. Chain 2 (Bitcoin): anchored in block 953699 (2026-06-14T22:00:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/73b75069-086a-41fc-9fb3-3dc93197a58a.json and https://artists.proofprofile.net/proofs/artist/73b75069-086a-41fc-9fb3-3dc93197a58a.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 0x74d55e804831331f51262aeb131878e79417511aad7b2377637992e6d59f98ac. 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/USKVL1110381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb00b3332d09949ed162d29dc38b2c1f4c478f0b13dff7045fc0da6551c338a53. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/USKVL1110382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc512c21874efb5a6b7b04dcccd62fdcb751100608104d391430c49064533cbde. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/USKVL1200283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc96cde901444a5a1663b81416aa1376ccc1e378ca669d859492833c30fc4be73. 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/USKVL1200284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7957bcdf84fdcb25b58e491d294b10e280f26aede99140f0b7c105104f5d6d2. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QMFME1588270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e7f5712e2c4dcac84d8b6ac56f0034e235f205aa6ec6199ee8b804cb9a5d6dd. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/QMFME1588271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17f3d327af112783e52b7cb238c518275a180e24474e037ffc80993c555683a0. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QMFME1588272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea3c31748d9d0b2e0d449a97e171c01128177ae92db3c9d8b554ccda7364e7bb. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QMFME1588274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4171a22b751cbfa187b13c04f5b08898aae842f8f513f2828266fcb0c3f5bcb. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QMFME1588275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe50c17abe055bdb610a39ae568872ba543ba9b3e43726c605f8ed74a87acebcd. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/QMFME1588276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71cc8b560211e918a2cc52c821ab7932b103daa9f9eff4c42d6c2b21e8f28603. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QMFME1588277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bde4eb4181812d7b6a51cad1efdc34792756073ed28b0e5dbee215472fafeca. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/QMFME1588278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x466691809a718644b1d6a1e375289b734ab5cca72f4b53000f25b5864072e423. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/QMBZ91339131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ef4a077f425c336d55d8b0dfcc91094634fe33b072f774f5865992a531fcefc. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QMBZ91339136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83b937fd104f291e677d8b8c706a1831fc903f2414185369defb18cdbb30e024. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/QMBZ91339139.