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 0xbcca8dc47a958e2645c8b262c4876e92d09b5f8ebfa9ac044b6f3ac35f88baa3. 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/6ae0a4da-f1e6-49d4-b434-6fa559657e20.json and https://artists.proofprofile.net/proofs/artist/6ae0a4da-f1e6-49d4-b434-6fa559657e20.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 0xca063808aef6f32a8528d0e376c70f47bbc51eab6188c40975849f0cfe8f9e27. 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/QZL382489288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8aecc5a972772a44ab4ee570b4a020ee30a3181d03b2985974808bcba565377. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZMEV2443558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8aecc5a972772a44ab4ee570b4a020ee30a3181d03b2985974808bcba565377. Chain 2 (Bitcoin): anchored in block 958850 (2026-07-20T08:32:30Z), 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/QZMEV2443558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29bc4644d613fee5e9bdec251a0d7e0609c7586c17a40fc4cd9db6af8a5a01b9. 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/QZMEV2476775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0403bab17417708674d3c2d7974df59b93a6b13e24d8e3ff6854fd3fb1e2e146. 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/QZNB82493783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad77e0af9e33aa01b22df5d75d06139ad3247a6a135427522dced10f467e4303. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZNB82493784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x064d5986ae71848d78406fd145d1378d0f1e18eae0fcbe070d7a482e4e68955b. 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/QZNB82493788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2138665a1704aa91f7ec8343397c3d1e7e277113854fc3aab6e3de655cb3d3f7. 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/QZNB82493790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ffb4803035f85e98a4a9e6cfa1d6473f0ef7efd52cb0b0c3c395d9996a0aac0. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/QZNB82493794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84fc46d249f1511c69e0768d09bb0718343252146db815448436dfe002bf3c9e. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/QZNB82493796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad77e0af9e33aa01b22df5d75d06139ad3247a6a135427522dced10f467e4303. 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/QZNB82493784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21fce135f5d4865cb16d73566fb7782b33a05cace023a7855bca89018a9309f8. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZNB82493792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d0192dcddee50a080ed6ddb357be85e77e2e025fa80d711c73e4c33efb1b1ec. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZNMU2417999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d0192dcddee50a080ed6ddb357be85e77e2e025fa80d711c73e4c33efb1b1ec. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/QZNMU2417999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6a6372695af4690af6a0d2ba598255caf9d0d6a078a2b4284ea6b0b7a1b5fc5. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZNMW2447735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5056f28418fdc9bbe12e30c2b6168a1e212a650bef5b79e3accd3ada68aeb61f. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/QZNMW2447737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2355c2175a4d1442e30a7c2a87e38d6d73596dfa3ec01ed5a1bff3b5844ff5f. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QZNMW2447739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x432031b1aebd78efadf36d7a5a8342718a4e7d77e6b7ec090d49c92f69b6f69a. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZNMW2447740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde2868dcdbed1e67c8003b81c6be78bddcabdc631b84f1fa491c93aaf38d1325. 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/QZNMW2447741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24035d0d8ee2983346eef42d487ba4979d1b70ee9200b790715d94a4bba35ccf. 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/QZNMW2447742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58b867955334a2b90dc8074f652d78f28ce3c6ecc3f8b5def2c943293a1544c5. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZNMW2447743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93d3a0e84786b500c9d617c5640495b6467e35e8bb481335c01315b89c68b322. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/QZMEV2520553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebbdaadb87f309f9a16fa0e53595ca76b101e873cf3dcbd109ee58881a413a57. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZNMT2540869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf8c2345e136c2d2fce9cd78453d840b3a78d7224f11565e084f93698e21e94d. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QZS7J2500759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14890008543b8e4889f2fafd68f385ca981740de6bfc06c04d6cbe891c8a9105. 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/QZS7J2501616.