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 0xebf0e687f5ce65103a1d9eaa84f33e506a73705a28747739ba679a20010e28a2. 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/ebc5220c-1eec-435b-868f-867bb8e8c877.json and https://artists.proofprofile.net/proofs/artist/ebc5220c-1eec-435b-868f-867bb8e8c877.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 0x84a7915591160029bd74e8c7e706284e5dbc5e104f8fbaf68d52932d3b4f0cf5. 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/QZHZ32244555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3406095771dfe335b918bccc19b1852dbbfdd2e01190f9675452ee64c5c9043e. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZHZ42047942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x128296a3a1a876a97314bea8933091d4764753bd12aea5f405157c6fdb80781f. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZHZ42047943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x330bd289eb4af26b68957244fb575aed9f06b40a3b2f4c31308189537e686c67. Chain 2 (Bitcoin): anchored in block 958126 (2026-07-15T08:17:14Z), 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/QZHZ42047946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6efbf78142cb503af54920a71d7757ee8a0825eb293e8dc444401af4821cda76. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QZHZ42042989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbdaff5b527064fe9c235210d91674097780112007ca832508c20bb97fd7cec8. 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/QZHZ42042991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x040072022b268f34736bf33463d0d8b42e8cd663c6717f53d85b167a22c70026. Chain 2 (Bitcoin): anchored in block 958124 (2026-07-15T08:13:46Z), 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/QZHZ42042993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacab9f8f6ce8fb545b9b2e23397d5181a59e182f96820a64411f6c557b410129. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZHZ42042994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x367e2b9ec477da54e2a2a8e53cbb56b27b73c5edf4fe896746dacc0dffd7f842. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZGLM1963623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f620a147500a858eab4f5eddc667fc60818a393843f45ada80d220f76f6bf3d. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZGLS2175412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbcbfc1093b48a67059ac2bd23d0ecd672268f3e2cae86a9a05d79a790966c5d. 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/QZHZ62198817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd796b4b06773db1e043dd5fd116f0713c8aa04ab70e859acd08ffabe30be07c. 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/QZTPX2117476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e7550ad828dde083dd94e5b4e4f1f99842574fdaff0001dd9931aa8cd210ef7. 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/QZ5AB2323235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68bd8ef19feb8c75700b01efd8fd50874d4248bc16759d96b182e8b997135215. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/QZ5AB2447732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20833f69557cd66cd80f07125ee418cd757ac15b0368a10b0083b36ec3eb2a15. 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/QZW9M2276107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fe99d39ecb9f85f6065a61295841bf0d03fd1972329d6380c5e477264e247fb. 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/QZ5AB2440456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2678da978264a98ec530c465605ce431b0416f135b5d55e16326cbc7eeb7a649. 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/QZW9L2331600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4838e7c71514acc8ef55264112585f14affb90ddae91e2fc3234f193d9f9f666. 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/QZNJY2382425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33092d602ce819e2fa0201849c5137d290ceb552f9ea3891595d164f351562bd. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/QZNWU2285773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x997bd25713aa1f391c1e5d91a9dcacd24459736fb515010193887ce7a6a8331e. 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/QZNJX2464689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffb455700a4e4fdb599a974de1920a86b65b198268e8723ee46dbc84ba7c9979. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/US3DF2525883.