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 0x39da19ee997a4bdf5f2bcc7fa4fc921c4a60cc9d97f93cbb104253ee3019eec0. 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/c1921cb0-100e-4d73-b44f-928494b203bf.json and https://artists.proofprofile.net/proofs/artist/c1921cb0-100e-4d73-b44f-928494b203bf.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 0x27521ee665b2bd77fdfe398529810cad5fca6b6430c388b08e2565cc99aca8a4. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZK6P2399787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd24c799cfc88c2b06054542a542aa51409042761e3a44395a094bd7ad2727cc. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZTAZ2333153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81ca026ba32f337ff45c987712123dd3d2f78451c88fd46c53cb6717b4eba708. 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/QZTB82362644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa04c87ba7f9205a89431628c42f855ec2f4620a2fd58514960f524e48e249809. Chain 2 (Bitcoin): anchored in block 957805 (2026-07-13T04:34:37Z), 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/QZFZ72479804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa16114a59019343eeb7a0070b496ac19804aa26ed8b711adb011b04139577c39. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/QZHNC2464735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc438f02cc6b298c05b287246b3eb65cabb5e10278079e781e0a7f6357d5f4824. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T21:04:55Z), 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/QZNWS2479817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9492a37db493f3ab446d844d58de70653869dd97204e0be4539cbf8608ada94. 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/QZWFH2468041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5f9b92936c5a16a7043d20256477aec9125696fce5ebe817d240656c6fb2ccd. 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/QZZ7U2409551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aa75705516960392813139f016a856ddb3d3323523d0b172f2287a475cff97e. 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/QZZ7U2409552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c710b4488279001795ac0e38b6f89e0797c7e1695c3a65d7cff730e6e1df765. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/QZZ7U2409553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14ebf53cbeb56a3917c7c2bc27abe9ce73108fb3e762d73b9cc327d73770fbd8. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/QZZ7U2409561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3cdfc65ddfae72f5290dc8635636e613fb92e01f51c919da255f31d58b987cf. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZHN32528739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7609f4bdf958ac3ea562cab6de40f89be71299c1d3bde2733a8c984dba685c3. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZTAX2566634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9417d8a02f13de207affb593074c345c2978a65d65b0966df59e387c26908f6d. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZTB92579152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93a59e2c09681ebfad0b8be11c09412456823bb984e0f6c5bca34e69c18a952a. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZWFF2545856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fc3e54da091078fcba0aa0a8cca0012340c56928ee3d913ac8ee2205a8aa356. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T15:21:21Z), 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/QZWFF2545857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1ef2bdbf8b87f830056908535d138df4b8815791fdf3985e2025df1243e55c5. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/QZWFF2545858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83d1fd3427c983f3d2ec611c868c5d121f957ba91b8c46bf073d6f9ab120bc6a. Chain 2 (Bitcoin): anchored in block 958535 (2026-07-18T09:42:49Z), 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/QZWFF2545859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x278399c34d057744e731e0dd423a59256fd84ee6c3b3061ae12d62ecaa271e13. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZWFF2545860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4eacf9d1e64229196420b664ee1354d93e64fdb17b67d45ca0aded999934dc4. 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/QZWFF2545861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c665753374b7eebe6091c3753780fb138e5ed594ec8a239c2bb204eaa136881. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZWFF2545865.