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 0x5cae81eaa5c79e3123753a7e3c64d5086dc537ce01f64b34b35e39f2410845c9. 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/069aaca6-5ffb-4737-a9a8-b400dfe3c841.json and https://artists.proofprofile.net/proofs/artist/069aaca6-5ffb-4737-a9a8-b400dfe3c841.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 0x3cc21a0a6edcc04ab9fa37839353dbdbb25f1e256f7564466c5bf5a8c2256c46. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/NOQ3P1903010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94b5fecc88e5c21769d28273d022db94ef49cd03a8b9c79fe7a5ddfd57186aa8. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/NOQ3P1908010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2e30e62e48b94e93ea57c6511ad1b7f5d0646704d1d847aba98db947abdb992. 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/NOQ3P1908030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x335c42509ad09539611f6bcc0b5d09459bd639ce649afba9076b7f590a5e11cf. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/NOQ3P1908060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d44b1d89bdef9ccec9bc8e9470d0042b14d8e6cfbb5a2b4d7b5da52482fe467. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/NOQ3P1908080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fa9bab1b199d12fc1200879a2d849d109293818ab3544207dcea889d323b923. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/NOQ3P2003010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3a40c95695cb2b6496f8be4c3fee8ec0b0ad2df2ffb789fc7fe1eaf13295d26. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/NOQ3P2004010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81948a6b667a6aa6a32851ecffba701afe44e0607532064d4251cc518486be4a. Chain 2 (Bitcoin): anchored in block 958733 (2026-07-19T12:51:21Z), 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/NOQ3P2006010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87588f5a4431c60094b79fff1c9ed47ee0923d0ed1d551f8ae61e30e3f57a45d. 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/NOQ3P2007010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x954939c0c1b75bef06d69ea6c5b12b5dccd31df8689fd5434421b85125fba41e. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/NOQ3P2008010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6f6778f14cc79e11a00f125fa43f97bdb0dab626b89ed3565a8671bf3491a3b. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/NOQ3P2101010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedd0208f82d0383112e4f30e0333cf8017ecb42e5b10572d20b4524c159fe502. 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/NOQ3P2102010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dff87f2869d457cb17bf2274fcd053d4d63ce2d06982494d67a43671af9b7ab. Chain 2 (Bitcoin): anchored in block 958568 (2026-07-18T15:23:47Z), 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/NOQ3P2103010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdef3d93f42b6c046c5b05bed3092d23e435927af5548328dad374bbb175778af. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/NOQ3P2104010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56d2374f369fca7e603874cdc46fef495209ed1fbd7e74f0a1b8b49a4e9a34c2. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/NOQ3P2203010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5b2edbe62bfcf593c8c7dc7d2072dd2efa43be1ceef0dcce6e7e188bf671da6. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/NOQ3P2205010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8403cc6f5f4626b15277aa8f32074a636165a9a3025fbe09017be53c8379a8d. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/NOQ3P2206010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ca53827109e4ea9b53b738c5ca4f21dbea5562116c0f147e58ef9c5662b54ba. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/NOQ3P2207010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcafc31e99adac235c6bc82a2580828a538f91eee39d2f697dd32e84daa64d0d6. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/NOQ3P2208010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2f57404814b0253d8c72b4366586d1e066b84176d432398511cc4f1367a9fd4. 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/NOQ3P2209040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08a41afdf226c764c9aafbc0467b6a3cddde2e8d7f2fd94de73e62d4ab551ad8. 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/NOQ3P2209070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55d2926da2ad1285be39a37260a164b3b7cd75c72396e3c67bb98740d85a29a8. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/NOQ3P2301010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3deb2f3f0f5086d7e80a4b3f647a10cc3a9377dbcdb7a318b3e3f04fc5cf6267. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/NOQ3P2302010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x354aa14af7d4bbda8491734d8c8547f8cd1745ace748fcfb5fbc333c033d4b70. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/NOQ3P2303010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x592bb32e304cd6c63804d94d21e35c48b063627669d25b87734c38286e80a3ab. 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/NOQ3P2304010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6815308206154c4eb0ff0312996b0fe2a4caf8abca5f575ffc42caa84ed72611. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/NOQ3P2305010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd52fbb7b8b5b068c769cb0000871a60534e889bdab191a77bf1fc57cc42a322a. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/NOQ3P2306010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72e8e63ab4cfd133b9a076ca91bf6d424ff6cbb3f3d5e35431a72104444d2019. Chain 2 (Bitcoin): anchored in block 958617 (2026-07-18T22:07:13Z), 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/NOQ3P2307010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38944f3d53b530db7ef3b0938b92cd313ea55ee4eea708f5e9285edf137e46ec. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/NOQ3P2401010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5708782a604c3d6c0529249dfbea6b4540fce07bceda0be44493c59becfd30f9. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/NOQ3P2403010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb25bd86972ecec478d6a7bd9402c7053817f03870454296b4b0915831752f89. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/NOQ3P2405010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99deda0a8b7dfd90f4474f53f71fce529b60268562772cb1e80e4b3f41b15a13. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/NOQ3P2406010.