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 0x085b50692c9849309d0bbbbd65198b86d4b3386c304e70f03dd8bc87a1181bdc. 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/4561aa04-2a70-42b4-b4ac-ad59ee07cb54.json and https://artists.proofprofile.net/proofs/artist/4561aa04-2a70-42b4-b4ac-ad59ee07cb54.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 0x45a1f34ccd10d5e1b0d9c4d77d93b4dc4f60daf53a84880395ac3662a95b8ec1. 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/NOHEK1314030.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1775be4920ec845df02f9d3b0f327c7f9e669f538aa4680bbf950fef2fa7fcff. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T20:58:53Z), 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/NOX9X3300203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaff669d0b673d30ed5b0105d644688b7672b1f8c5973520fbd20161853e247f8. 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/NOX9X3300204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb454ba102c1bdc18f5363c32a0644913d59f4f5852604eb8caeab598ee9c5ad1. 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/NOX9X3300207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x547aa25e4bfb18e6dc6b2320ed1d07aa601f14b6ff89d8a456c95bda10f38ffd. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/NOX9X3300208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27b8271839db00e79484de5739430a260681cd2a67d63472dacf858bc8f28663. 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/NOX9X3300212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x198f6b1a04d76d25e72d5060accc55020c52391163c4ce86baa586d073c04035. 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/NOX9X3300214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21440ebe6c9521e056b03f3b053e31d96bbbbee0b2165ab941898bac3b2c94ce. 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/NOJKB1604020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6e924b48590f4a4295865221a07c995564fd5008a7e022acb1e61e78b4c97d8. 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/NOJKB1604070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6f53e9204cf2c0ee8a7e7de72fa53f86a5e5ccdf9689f2251a7e42b6ba9b08b. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/NOJKB1604080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3016a8e63dbf09495cfcb5c4a37759db61c0abaec6cd91056643bbffa120b902. 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/NOJKB1604100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x621749535fdb739b02c669e87c75a726dfb601ec4f13391fdf7e67073ba9670a. 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/NOOSL0302010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x550098bdf4710d9599969f646fada4eaf7b4c99239ca852a7f1cb54094e9a40a. 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/NOGNA9808030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5796c9184cbb19cd9602b063c9cd74c45a47c96116522d590ca44e19074aed5. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NOGTA9660110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13db91649388f43329290fcc1825c14138afa8af94b9bc38cffe6c474a9ef836. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/NOOSL0007070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1f34be83461a01d023f6568a76869839a8b2f19c5d5cdbd9c79485791a5f7e7. 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/NOOSL0007140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c32d294c6540e9e7a096af005fa5e34b0a2c70013497b8e4501755ffb55dcfc. 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/NOGTA9646010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1a82254c8b5be1230fe755b66384d225b2be5abb044f84a4470c947eb5b9d01. 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/NOOSL0203050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1c8079d0c4b99239a8cff1be8767f8803bba424bdabc94f23d911f2d71cf3d4. 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/NOGTA9660070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3058a6f059b1671cbe5d5bd07d6a88394d6a9c2330e2b8f7d395a5b03cbfb68c. 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/NOSFR0701020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c48209a295a1fd7c78517f4c8a467311f0e2a1b24c54c910e1b877bbf049a14. 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/NOGTA5801050.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x931fabeda971df0bbfe12681a606ee2efe7cafe0c06268a48d8e2bdc609cc2e9. 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/NOJKB2407010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24424b1c3f5605f9f8f8458c5278a13f90d6ea0d6a67f252843545bedd02ef59. 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/NOJKB2307010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc75dc834f690657742db0c7f224c91d661ffbda5ce29c3e646429e9cf089f159. 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/NOJKB2122010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a6d64b61fc81462ea02604c940ed2a7b4798ca37ebd1d59e00cb7b477e14b8b. 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/NOJKB2113010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8ddf3a82266f6d131ef11449235a5365402292871cc1d015cc42961a9572aaa. 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/NOJKB2015010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95609008c3323a88a823528ea969d25aeb72be2ab4ca3657deb784aebecb3347. 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/NOJKB1908010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b1ef50dcc28830f9f99ea21e0efa23dbf5321349f1a08da1c1bcaeb7037160b. 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/NOJKB1806010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x560818f6dc5ea427bda1b6e125f4d7459129226a5e43b8de80f03695d6a4a14e. 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/NOOSL0801010.