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 0x8eea04040bfc381130b8e78a308fead60f26053a507580df52ffd6bbb6331981. 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/0aaa8171-3e48-46d1-b343-8a8223f60fc6.json and https://artists.proofprofile.net/proofs/artist/0aaa8171-3e48-46d1-b343-8a8223f60fc6.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 0x1d8cb788ae245ead1a44f1143183ab91e5fada2220e26263f431fad107bcdf15. Chain 2 (Bitcoin): anchored in block 959034 (2026-07-21T16:34:25Z), 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/BCQY02200016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67afc792d513d5a8f1916840896fc5645d1c83d2d8565edd8be92a962a1691fb. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZGLM2241343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b120f85e7cbffcac7a00fc6c3ef3526172945c9ded82ef4d3fa52bde6d7187b. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZW9N2215036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf65813ae5723b61dd2f08b1c31a8bd1828a8e09f145442156a72fe4a67165a7a. 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/QZW9N2215904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08016576f86af3d433891be3a2a9b6d1d2491ef6daf80483a3e9a86e47fff1ab. 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/QZTVM2373349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91859e45ec4ae744871a3d67cffd195e562a4cb6ba8c303a0a0d8b9fe0608932. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZW9K2305058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0c5fb42884a0604af7a1fe67dcd9638787f9974a32a079ffb27b09f2bdfa839. 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/QZW9K2347571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9108025107481f41cc45179945a533e97a088d6a69b4e1fd182ef26a2d17dfff. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/QZW9L2319929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda73e10caa40aa60b6123c0ad9e5798289ab43a312b13504e1453d19cbdbfb40. 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/QZNJV2409844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c56377a776956a09eeffb713c5d6c6769585c8fd8a1e570d21c23bab3f9d8d7. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/QZNJW2451336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ac45a300c7006525a51dedfdef2c1fb34608215482fed635ad8e09832571cbe. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T10:12:17Z), 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/QZTPX2409280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5213ddefb15d81503f26bcba528340140e9dd4cfa8a84b44f80429eb1300996. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/QZW9K2456207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x286ba31d5f3239145ea8e934d4589b5eec57b73f13aeabbf0b19947ad08a06e9. 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/GXBAV2544264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17696e9925047630e99d16f5bb6fb27adde2b860703f386905ba79b7031f3bf7. Chain 2 (Bitcoin): anchored in block 959013 (2026-07-21T13:39:11Z), 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/US7VG2564968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x229d494efb8f965673f2d367070391080b30ff7d26fabe79769907cc6ebbdc01. 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/QZGLS2503824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c1e0f3e30f0a8eef993b1f84966e5d86af88f853e9f798b4175333061c8e44a. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/QZGLS2551316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a80e85369e987347f090c416479eed55d3f4f0c689141dc58e1949d310fb94c. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZNJV2569160.