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 0x195670ac1d56b6f2f17ba27bbe1506a855123794e115779e2acb9f90a377d129. 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/6e0fc8a5-7619-4d2f-8da4-4b5d86f9abf8.json and https://artists.proofprofile.net/proofs/artist/6e0fc8a5-7619-4d2f-8da4-4b5d86f9abf8.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 0x569aca0061f200daa2faebb2a68c8d6c7c5ee2d2698601184ef2a7d11a286a03. 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/QZFZ22109227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfce31a0cc0e7ed8e4984598925f55ac52df53bae1336525d179f0a9619faed1a. Chain 2 (Bitcoin): anchored in block 958903 (2026-07-20T18:04:05Z), 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/QZFZ22109229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6fbe02e11831f2e16fafc62bde6973409f93cd7747d91b8b2382311ed3e73ea. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QZNWS2199034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6235f2963bfdd00f79eab3f274485c37d87f5cdb062fd66c98fc67f0a2586eaf. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZNWS2199038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb2504c9aceb0c1d421fb20f2b8783b1137fec3248c9cddbfef5f67c1dbff7ac. 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/QZHN72257038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3879a4add8b6a1c8ad9a5af7f3aeda2183163f98d7fc868f22af92a667485b87. 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/QZK6Q2340340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d49c7cab7de6f7fb1e4afe1700888c42dd4dc48a0842071d93e404d20651e82. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/QZHN62488878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6cfe31bc3bea5e8f426fcac7ea481cde943be7512b6db8e97b9340dc20c9aac. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZHN62488879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81d20c721e31138344ace08010d284c25f094594ba9a2a9e77e086ba478970d0. 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/QZHN62488880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa45db11a0de863c82ea9a8093d7c7dd9041734f7daa9f1c0eba5482bdd080be5. 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/QZHN62488882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x287db1f68c1a21fdfab2cbffe510c5283dc4117fb9f428cf25e9fdecd89b12a4. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T13:28:02Z), 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/QZHN62488884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x474867b10b34c3552991861823b719426aa0603f3c4d24579ae7ecfcc06397c6. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T18:00:31Z), 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/QZHN62488886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac58c806079c9b5c43c72e4b169bdc51d03e871e000fda6ed872003e911cdd35. Chain 2 (Bitcoin): anchored in block 958911 (2026-07-20T16:46:31Z), 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/QT3EX2447499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d3a594099bcd4d4ea18e7ca09e135af66debf139ed4af4e33e170e7ff117981. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QT3EZ2432884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc40f8c156d59ff2705b0771462a36dfb3362aef814e4aa4a07e0263d6990c7d. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZTAU2581360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb1d623da758f15b34490e1dfd277329ce61afebecd56bd735a74b301a3065d2. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QZTAU2581361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3bd6576da9372a8b66a59b826af44a3380571326666f2bf20b30437500e7c33. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/QZTAU2581363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d1db69d4c68b6326dd7f04070585b375220ffdb111a9bb9e8d52ab1ad6d3fb0. Chain 2 (Bitcoin): anchored in block 957780 (2026-07-13T00:36:44Z), 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/QZTB42510175.