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 0x4cb3ed690243173db4abb6225a13eb2862609f917fd94f427f8e2d5a6a10dba2. 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/4792fa82-d876-4a72-9fb3-d348efce825e.json and https://artists.proofprofile.net/proofs/artist/4792fa82-d876-4a72-9fb3-d348efce825e.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 0x2ab01bbf073416568b661d31277426ec9ca778b501e9b2eca73d7ead14d7edc4. 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/HKC992425889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcec75b7749036b5408ffef0e8abe5f19f9edbf00021dc219c13cede3b5741c7. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/HKC992625391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9222c5c50b8cfea6c4f49228f52061cb2dec3e7d5742fad1c58a2d22de5d9a74. 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/HKC992624621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c9300a1f318e59a1450b120cf1c9249c264557ff17e2755cf93bea09f63fe25. 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/HKC992524845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d00deb20940ff8fb7ecc025cd85d0783ccc3805de575eac1e99fd1a5942a0f7. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T16:31:59Z), 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/HKC992524668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc324395c72009b80aa140cf57f5e305a668b8d398c1ec7efdde483a188c91bcf. 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/HKC992425365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1536a8d9cf04c80206180157e15b9609656a7fa2e9b939835f119234a4393a41. 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/HKC992425005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf32a828ef32e67bffde0aabba0ff90712add13f695546c7a10ee1c5ccc6d04f1. 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/HKC992424248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbcc4743fc18723b29c9babed472f6b2e8b72c2f473082ac1c2c0dff8fc8cac3. 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/HKG731684493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe31d05aadcf20af41d127ad91887ec1c5102f08d6ace1fc3dd929c07158464a3. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/HKG731683025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62124a8e3fad4780ebcdbaad0c63db7ff157502f43bb4dbbdf0b04cc59f24d5c. 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/HKG731681213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ba7655f9e07ab0a7fc923d9d0a23837b0209ac8ab61ebf74edc0f8d5c4c530b. 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/HKG731682175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x111b58d2dbfd398ce26c7624fa1be495bf0b6b40e561d6f93384354fb102ec6b. 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/HKC992325767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1c44508a9ae719cd3387971954ec44b41786d06d091168bee4e0c4be1f2ce01. 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/HKC992325389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f5c1c702f255f554eb17c6314e5b046a3481fead1911a46df22cefe78937340. 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/HKC992325110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85e2b19faabddbc0280660b3834bca9aae614a4685249cdbdf90bab9a87e3759. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/HKC992325037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38db7286c71e11042cc7eb4f56d9e7f1297c87e4d4ae11b8fb30aad69b0d6f7d. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/HKC992324036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa06e7cc05a1b3abc22ac00d5b10bec03721ff2acc690fa2450256402ed86e684. 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/HKG732305321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c95dd3858b6d87ddc4d059d5d159589b71276c738797e0c28c84cdb717ccce8. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/HKG732289139.