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 0x8b56a077b6846ac14f06cf7b5b5ed538e350100def8a9bf0fc8e8ae04879d969. 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/4ee4bb8a-4d83-4744-80c0-7d002d4a4464.json and https://artists.proofprofile.net/proofs/artist/4ee4bb8a-4d83-4744-80c0-7d002d4a4464.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 0xc779c6d4fb2cfbda1aa52f0048e5ef9ce51d6ed0737522e3f72aa7056ab115af. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/FIEMS8700200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x847310e346952e55654343302e358917b89314be2c2235937db26ddb7f58d643. 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/FIEMS9001000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fa6d51a49eb932c10a66816564f5aff3065e80bdec18b53e921bc7d1d03cc45. 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/FIEMS9100600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ac88561e3400a1371b9ef7d692798d825a6ef86b59deee8e296586302cd65e9. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/FIBMB9400043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b4b0c2c8a14bde0557f2bdcc211cf5d0ac66d50a56c84e70d8d80f4552303c1. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/FIBMB9400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x814483ca3ed5af9c19f674f8bc7ae477e0af745666f4b61d25f3ec7e955b1389. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/FIBMB9700023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc5d96f84850df070553e22b62da67ae13341ccbf2e69081b9df8954175670d9. 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/FIBMB9700010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7590b421c28e51295b59f7abc4718935e8ec0931f99973976183621541e7532. 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/FIBMB9700054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa63a4a1fc780c43c8906f200630ffb90213ab13ba16bcb868253d49fed41b6d5. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/FIEMS8901500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19f16bd51742b37a8bbcb85865f3dce5ce2672af6f7f5dd5edcca88d5a8f02e5. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/FIEMS9000600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x215b432d1de618f3a1d5040ab09053caf81afeb0ebc05bd3cbee86b2c2c0f309. 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/FIEMS8800400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b80642afec9df23b9006f53257232ae0ab575b298c257c9a1ddef2560996c36. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/FIEMS9200801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6f26e198e285eba5a911c803dd1bba6e2b62db04cc3bf709fb82b962d7dfa8d. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/FIBAR0900170.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ac88561e3400a1371b9ef7d692798d825a6ef86b59deee8e296586302cd65e9. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/FIBMB9400043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ffaa6428ab2248fab9cffa53a2fbcdb1a40eb6f102300032ff36968465f66d7. 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/FIBMB9400039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5055d895c78b1b6a6895a985546c0b0d033024e514a913089dddf5835c3c8e15. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/FIBMB9700052.