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 0xefdfefddfaa27896b449b26e3bbb63ea54bf5beee972a8563a58d27b89c23767. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/89796b77-ed1e-4c5e-9aa8-7375fe26f57f.json and https://artists.proofprofile.net/proofs/artist/89796b77-ed1e-4c5e-9aa8-7375fe26f57f.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 0x8cbf07b447c93a3b7cc2866103b3651688ff13b2b58b401c145148ba2cf255fe. 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/QZRP42406088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7819f247213ecaefe41788b9cd1dd50c54725eb1f5d4d4a29b9f4e0f6f485acc. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZNWS2421513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f201c23c507fbf89feaae62e0b9394437dc9ea4331fc47e34495917eb88ad3a. 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/QZNWQ2449618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e350569a1ec929da68ad9b391cb0ce63bd3fc4a717389a3606065cb33f854b3. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZHNC2437159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd81a5a0b0fba1931a8d318e5ed849ea9e777e71493005fb17b0b3f4a5966e967. 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/QZES82484023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc90f8018ceaa85bf1fd39e1244be0fc0e4a86711b2429f5615340931f8a0f682. 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/QZFZ32407602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27547e61e2690560cb4daa4242239218a62901376ea75612a277136efed9c6d9. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/QZFZ22491932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd55430dc7d5cbd15e50844e163e0879b7b6d06b25126307cab7a50bccdc04608. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/QZTBC2359000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdef42d4ed2261c91c78ebc08e0fdecc4edda47e5831b7c7c8fbd7c514726b9d2. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZTAY2367336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22c10d36718331f214e5736e9396f36b631436a7ec2bca5974fed271594f15eb. 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/QZPLS2387890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2b9510139bff6099a8d36b38e686c76afe877cfcf8841db00a633bffce7cf7d. 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/QZPLS2385895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4250c24ec86c7c49e0e5775181fcfcc5213bedaab413c1c8f8c5c08da3d8c62e. 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/QZMEP2343015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa06247cb4ecdc2ee592425117b8f286aeb73e6f64078c5ab22afa81131a36a74. 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/QZMEM2363751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8b42464d1564464ebf7910e53e9f272762a2b58fb8131887012b30fa7adac98. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZHN82370902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1331544db2ccc46da9d4ea47fc9ccd29edb050b9027b84cb0adcebd213283e0c. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/QZFYY2323542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6747c05b234edfdfa8f6dc2166a528500b766bce21545c39b1b8193d51866b77. 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/QZTAT2217401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5b6b8cc505cf48932ad59bd3e5083952ff364e2e76e4c6f852cbee61b675513. 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/QZTAT2217400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x760335e7c7f18a51d6cb3d5ec6f4db405fb78ef5c2b92404fcc27d93ce3be129. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZTBC2400567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde3d0fe3d015d09f2e46d3aa5888fb5b38c5e79ef928aba451d68015f1406d1c. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QZZ7P2415273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43cffcaf9f0de7382fd9857051cb5d5c52f5ddbb99672260b083afe9130ea79e. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZZ7P2415274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21a296523b3aea579f58e053b2caffa1f65e9da3a952f187a9551c11727080f1. 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/QZZ7P2415276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9548baa5be3e1d6ab62ea874470976a7fb1a33b33906b1d6c3cfbf423f989548. 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/QZZ7P2415278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2cea4f6fffb02850e1e50298cb0c04bf74a1582067d9fdd3c9af5e6a27618ec. 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/QZZ7P2415279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60d7cd2ff3dcf8a047532a7b194dcf80ab91b491e40df8ac038c8a3b1d8e8511. 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/QZDA52557527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd859af34348326d7a2b10fe1fd1b77eeabd4341707b5ffc0e7e2bc99f252100. 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/QZDA72523542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2ac47e7b538c81986e045a68c0114b8bf586afeaaad45f56e2b6d6b6eb036ba. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/QT3EX2452738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c8f68643ed0028c0b4000b1f51e0fed820fcc264251553753d8bea6e1ba1b72. 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/QZZ782451449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d7fedbd2ef3d77b5c1bb7f1799b6ff5d3540f58c89713891382936e15e8fd99. 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/QZK6J2492364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60f671431313b8098972b0e42b472d821ed6a4b48553004d596c7a970f07abcf. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/QZWFS2439331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c47bb339ac197cbb92e34bd85e8ea5d07d42da997365ed42abc7716ad603933. 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/QZWFK2436698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f41cbea0c0c5b5af2fc5ec2a611842a07c2351c3923f5e0dd919d531b6f61c5. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZWFJ2445535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8aea53192eb87fe42ab16e390a6e22357b7f6a0ee0eb1c36b7e2a063c9c8a4f8. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZTBD2438822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19cd6159027a6633bcc24a042941f4e47422cfeac4586fc486862e80e079afd9. 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/QZTB82442930.