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 0xfc12bd3ee1e2e744b913313cf62bb1603ff33341996fc12d0155d6879f837100. 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/af923bb0-5f14-4b8e-afe0-fc6d83132bba.json and https://artists.proofprofile.net/proofs/artist/af923bb0-5f14-4b8e-afe0-fc6d83132bba.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 0xd3d6fb82c6e952c2761b8222e1c528e546ca5106a4026dbe3a17240de5eadd7d. 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/QZTAT2140043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0fb1dd4472f779ef1e2c3f3606a66959a9204b8e444e8b5cf432b3e6792dd41. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/QZTAT2140044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x123a8d5c54e2c5e6504d3f44171b88958319ef11af5d6d9db87924a8d7ffa232. 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/QZTAT2140045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf658524287af24aa3a1e932265b6e7ce6a204e5c19c1f13f01551af073ca91f9. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/QZTAT2140046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x688939ca40d3e3805c231da7221cd0cd2c5491fbfd8b204430f00d5a947ab8b1. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/QZTAT2140047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39abd7e46565b8c12236c38c558097c388caa65b51c16a22087008826eb699e1. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/QZTAT2140048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6454cf4c6533f9aa38ea2e9cb97c0902affae4179f2e028b7eff9b010f8d511. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZTAT2140049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f7d9523917bab77f86fbef70e18633af03569cd895eab79618fd73415984732. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/USDY41992210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9af6ce95d1225c730dbfb681e1fdd9fbe17be659bd31e0b2c576fd92ea16b2a. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/USDY41992212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89b0198c66d309ffa14608f9bee39b603b3b413e59a57ff66445b9041427d0ae. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/USL4R1826138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd5b7a227fc3eda5cfc3dd0c41f707a3555e1304046875518cd732c17bdd19ea. 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/USL4R1826142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd18cf58a9e509b55c05f6cbc151d94ff1f19304eb66939c5660b947c0803db9d. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/USHM91839276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83fc40ffe6877452039c4ce9083389e57ff4fcee6fd76e163e68b2c9aca42bdc. 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/USHM91839282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x169689bcc00c6f7a208cf58e341e0d3ca547440ee772ab66f9632a49eff72b20. Chain 2 (Bitcoin): anchored in block 957198 (2026-07-08T15:54:54Z), 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/USCGH1660293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aba14a49240ea96688598bc421a213159682d3f8e6ab00235649dac39ef5dc4. 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/USCGH1660294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7c4513d39b241e03d7d0c337212948320f5bedf69d844a3f323b4733bad86ac. 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/USCGH1660296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadaeaf2711dcfde1fb8216f0e3cac1da2f06e6f62e67406b8bf82ad6dad6b559. 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/USCGH1660297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ea15ecd90861eec47abcafdc0ccd76fd300775e9f9f57b4dabae2108b16f325. 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/USCGH1660298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4837b2662f2091a3f93dcfe8768815d36e4e241b4e3919d7e9a0d316a556ef0c. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/USCGH1660299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe72935f8ded5b35e27bdde5c8ebc0fc44efa7353a7bd4c308873df1afba8398. 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/USCGH1660300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bdc51d423e9f6a3d359a47693b20dafca6098b1b2b5053c15e2d59adfe3e73a. 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/QZTAW2468594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5227d41c663143e000500f6d9610488a2caeac2f62711d878eb0341a31ce3f0d. 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/USHM82453099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb789a949402c8146c7be4620074f46cb2e2178643ad2cf5b4bc1933abe9357fb. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/QZHN72337051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3f50069cfa41cc857a0a813371db599ba53a857bc1bda14370882fc56eebe05. 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/QZTB32284848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x257c32257160f41844a2b1e146a13fa98e55b262a27ba23f346bf5a4b9b1853c. 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/QZNWQ2226477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x988633cd2c7fd2f773dbd0afb345ee6b6b6182d3a18e0aaf27b4dce16916fef0. 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/QZPLR2153780.