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 0xd329ebf3796e8fdfff15edd7d8b873e69674a723455729daf329e3e73886aea1. Chain 2 (Bitcoin): anchored in block 953736 (2026-06-15T03:21:19Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/97f18723-02c1-4e9f-a47e-a75dc442ac66.json and https://artists.proofprofile.net/proofs/artist/97f18723-02c1-4e9f-a47e-a75dc442ac66.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 0xf2635a9bfbe1db33822e43f0ef5bc7702d7a75707891e636aa55447588d7a36c. 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/QZES62430562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1948715c13a22a5751eb45a5ad94a4de78de0d27b445fe5367a19a4c5ac44906. 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/QZES62430563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe926193b8281b4055a3202b088fe1e0565d5966429338c560dbd801741f184da. 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/QZES62430564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f9e5fdc79aece16d43204e69b240eebdc26a43bccdfed5712cd99cfe57fb6c5. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QZES62430565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e9b878ef48662ddd2e0bbda72f7b4385020c55462484050c2ba97a2a60e64c1. 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/QZES62430566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda3fa577cff92b42e5fd5912fc3cfea0c07c87bad2f52a13e5baac4f23db46e9. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/QZES62430567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcf27b5aa6e81f89c7c914508899e3f328555d420c8111951c49293f1d148cbd. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZES62430569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9b20eb405829d41d1e07d780db6d0d3946acbf8f9c7a20f6678bd696de63d7c. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/QZES62429554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1c659e6d071130017382f72a3d32511ec4a801e03c219b86d3ef87d529b4bb8. 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/QZES62430570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9b20eb405829d41d1e07d780db6d0d3946acbf8f9c7a20f6678bd696de63d7c. 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/QZES62429554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4d8daa5bb53a7a9a8c37d2f8b213eaccb2eac150991732419380e7e9ba07dd6. 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/QZTBF2338191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d41327a47caa68d4b4433de853c6e25c604f5412aa8a1982b2c37155bdc202a. 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/QZNWX2310626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x222284970d05f274ba9ef7297dc39a64e7b3b853a54d9a9e5808116794a973d7. 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/QZNWV2180700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9392108bed1d720d9c8dd2068becbd28432897e87233213c934142fb028e112b. 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/QZNWV2157588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9392108bed1d720d9c8dd2068becbd28432897e87233213c934142fb028e112b. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZNWV2157588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd32c6b6f5f9c8ea6758f29ba6f555592b259c4be6efb9f8d45e048dbe71ab1d. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZHN51969795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8c8aa1d481ca6d4840ae96a9a3d5b7e1dd4847b8d49d0f1c2ce2d4ba4dcbd50. 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/QZHN51969694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x221dc794b2a2857831ac9e3c62d0a948a62d5c62219e98e26f5c18c638c4bf23. 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/QZHN41972615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3d7f3d353ff1754e0c6496ca427997c5aa364a889a4fddc5bb6fc36c3a20479. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/QZFYX1971067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37b1dfba60504a16c6263db8eefdd33eaa88cced6cf5a1bec7106bddf134fb80. 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/QZFYX1971068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e152ff1cd8cd3c1e36343121751514e51b02e87a907ea958c9b30ac424b93f9. 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/QZFYX1971069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5512f6027fab5b4ad6d473fae349382bb11f1e5f7781278ada2ae818f9f366e. 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/QZFYX1971070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda0e5ea7b795f9309fdc93cd8c4074f110a4798cbaf1732fea10222e79411008. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZNWX2126847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3aa56a0918c5afd0c5222f1874f5b244d8efb2d222064767d86f944852a2208c. 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/QZK6G2223653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd003a7e49cb6656ecde7bac0e3e51d9c3a23f32710c78f51bfdf7ea41201a38f. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZHN42212666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84a03121f07a1c8433f2bf98aca2dda83fdde25da23f78d1713e781a863e0c29. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/QZNWY2433547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x887be43a14e48095bb9b711e69e311493e84a0ba68e1d52c5ff63c96d87794fb. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/QZTB82250207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd003a7e49cb6656ecde7bac0e3e51d9c3a23f32710c78f51bfdf7ea41201a38f. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/QZHN42212666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda0e5ea7b795f9309fdc93cd8c4074f110a4798cbaf1732fea10222e79411008. 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/QZNWX2126847.