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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a8c1ecaa25e4c92756eeac4531271f1377eab3ca132346bd1fad6bc3562e5df. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0680c1e0-76df-48c3-bd56-8008e5f7862c.json and https://artists.proofprofile.net/proofs/artist/0680c1e0-76df-48c3-bd56-8008e5f7862c.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6dbe1de1b1e99ef09c233d9fd75b4fb3b6cb4aa7d0b660dbd19bdc1ac843a87. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/ZAC012300565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x339a38542ab07b85cd1aaa3c61475f29534fc47e39daf55a86fe50faabc40eda. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/ZAC012400472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bed3da7ca7e1dc8a991c295ebd3e272cfb80622c769f96229bac4c413faa318. 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/ZAC012500069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dcab1161b768de8ff3ddf590c0aa3b50954365c9d18dc37183a37a90481f6be. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/ZAC012500071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf6bece58584a84701206567e06684b48b20501586c3d81e18b28f70f3e61fdd. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T15:01:04Z), 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/ZAC012500073.
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 0x8ea3823f24e4a141b0cf8983bccd457f321a6dc752191c8eee1566df6980b5e2. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/ZAC012500070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c17c7dc01f5cfa56317d1ced1d0379e833cefb15ac3b2532388536faaaa0e06. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/ZAC012500072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21951466ed332121dd9a7eb7abf9c6dbbad184502ca567e2d83b3b4dcb705953. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/ZAC012500074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe3ce3b68c706fb3726cf2b46e2fdf2fb41aea020e6a2a43d7af6f8f927cf93b. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/ZAC012500581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dff2207fdc3c4c1415eb7c1b500c0e68a5261f2cd61ff0576ab300476bab69e. 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/ZAC012300015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x856109b92d6e4ae312a5d355d4498235faa406535374acadde9c9ab154b4b306. 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/ZAC012300016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5d27a5682fad708e7aaee562a0b4de7b73459bc457644233e9596f582fe4d6c. 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/ZAC012300017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x528ef3534ebda5247d4371e3f51521f6faab23bfcda8088c886ff70d31e5dc26. 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/ZAC012300019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9656187d50da83b53ab9dd86080a9d9aff42fd69ee1ff2501b8d452c652cc13. 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/ZAC012300021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a9aea3a578ce6cf2787260051a273e746a43dd33cf1d390cf067fdc2f5861f2. 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/ZAC012500020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x272ecbd35f492d470fe3a0eeaea770bec7d7b1c630e2c2aefd02084faf4028f3. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/ZAC012500023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd051f1ac8bac122d763a12ae9669db967fe71c8e13f2eebdea2e3b2a198d15db. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/ZAC012201438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a1d40c4d54f3ed7be4cb9d7f5dffddd814db487e1f5a6363ce67396d9055484. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/ZAC012300023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x657f965aaabb758337f2651d197915e8300bd5f007ce9145a098ec85b80d8427. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/ZAC012300026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x538d15857e4e35d79504698affc68a4fd37fda78bdac69a2c84d3e7ba0444266. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/ZAC012500033.