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 0x6c927608167722878db52c0c9afb3fad9030fa96a935875cea0cd1ddcf9c60a1. Chain 2 (Bitcoin): anchored in block 953909 (2026-06-16T07:53:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0a3808d1-5fe7-4661-9283-47fd239bb044.json and https://artists.proofprofile.net/proofs/artist/0a3808d1-5fe7-4661-9283-47fd239bb044.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 0x621523518c34baa541abf801196b618a68874f408a4ad04dec425fbee0d6e568. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/ES6100679509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a4244344e04ef8fdd1f8fee27929034b62e64019d290403bf12ee4e58c8c462. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USA371078252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a254fc8a16cbe2ad7ef211195222c274829bb2a6ebc1a92d2e1c13cb1b65d4c. 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/ES5950601839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97988491f085b44d8928c6f946dbd1b9cfec1ee61d1a3f1c669b1dd9c7069a86. 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/ES5950601840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48b8265b98f515360bcfb3f946e8ef00d294256844a5f9d8712835d1f08fb8ab. 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/ES5950200100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8fecda535d99e64c8acdf9146b5a8a7f9e8b490e800c2bc23658de43b880572. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/ES5950601842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x783e13df925c058938d3f2e9636a660bb1c626199ba6e0a563dbf02993b5e413. 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/ES5950200399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f32464e4377170855c6ef53f312878e5909ba8124e75da2b490d100d17e958e. 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/ES5950601844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6892da654d6426c9a07ea9468e7095800bb3bebdaa038994ade20b18812c8b8c. 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/ES5950601845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf655078ca43044f6a542eca2162dc9f16d89f604d7917c04f2abef6c2cbcc0bb. 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/ES5950601846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe52073bf5d5ff74fb91790a4e240466d0e9fd660f00cdbdea0e23117f16c9c3. Chain 2 (Bitcoin): anchored in block 960383 (2026-07-31T09:50:37Z), 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/ES5950601847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33211dc91c7fc501258b34f79670ea93ad79aa2326bd1d5144ce3b0e4c6b6a15. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/ES5950200059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf36ab126b06d7140615435bef05a2c28fee48263252b82cbf31ff3c626a7a5f. 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/ES5950601849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ce224b72365f872b165bdcf3d64609d050c93e47da38d3143dd2edbb59d2128. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/ES5950601850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64c7c1524fb52869b53ce0dee6bd2a12603e9954411f6be90f50dfafbea6ecdd. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/ES5950601851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69732aedb34a49858076dc6e3b74745856e575f6b9332aca7fbce328a3cf1930. 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/ES5950601852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ae5efdd2bbef0a657e04cf43a4a1ec458485956cd85fe1bc69bec91fb88ecf0. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/ES5950601853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a797cbb4b658b89a06751177ff093bc8e65a1cfad906d768b46c1c35f320337. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/ES5950601854.
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