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 0x4547d95667d9d023364a774aab5e8f30693b688be4a340cecdadb53603b63714. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/751b9624-dd54-47e5-a04d-2ca0f2254a71.json and https://artists.proofprofile.net/proofs/artist/751b9624-dd54-47e5-a04d-2ca0f2254a71.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 0x49730099a6a093237717e4f20a310b45dd9b777eddf57503c191b66e1cddbf3e. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/IT1F42100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x468fa6632e9c4a33c3b65042a4a8b51b797546e42b72a27dea3c61f112ad2212. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/IT1F42100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28be1e5e564ae7b5e92bccb9daf20a851505b2ef6fa6725b3bc84549ff242356. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/IT1F42100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5e2db679526098ffb944a47dd29a4571bc246257e0e6a30986ffdc8276ac12a. 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/IT1F42100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac2b5ba8825605ef526cf3bdb7d0abef33dad7f786e6089c4b17d666741c1fd5. 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/IT1F42100005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dec3f52303c465559291040668581be6ed8847a21e215b3d255be9251d91fad. 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/IT1F42100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67b07a3bbe21186c11d7dc4e2618d2f86bd4042cc809a34d638138588904a2a4. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/IT1F42100007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba4e28fb9436f9e2ccff325f0647884e461e1effc5885e6ac030648a9d1254f3. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/IT1F42100008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81cb5c768a6e2598bcc446f0ac19bdbd50d760a31136d2402a35bd453f1d5d75. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/IT1F42100009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4819ffef8181c3df5ff8e7fff3de702fc5e090c6d2e57ae64fce3afccbf7207f. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/IT1F42100010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd5886d9778153b0a948b5614f8824983d8b1ba5fd9b27c308cfed6ec1a19783. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/IT1F42100011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd883eedea1b363e5b575ed4092c29ab0f5b26438756a488ccbebbee191da5b5d. 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/IT1F42100013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x759269903294d5f29a7254e629849c4443bb06d892997c8ffffe25479b7b06c0. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/SEYHZ1500802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24771af25394dc585c5624549eb7fc81c49fae7c63fe40ce585762a7e89578c8. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/SEYHZ1500803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x676b5e175a26753166575db036f32e22c27f58c95cd6788ca50ea0bd1b6b3b66. 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/SEYHZ1500804.