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 0x0caa029a862f77c187b15df524095134e6725c2b7de17d2bb2da729edf88bc56. 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/ab18a32d-d4d0-4cbd-b814-334ddda05aab.json and https://artists.proofprofile.net/proofs/artist/ab18a32d-d4d0-4cbd-b814-334ddda05aab.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 0x53c1f510906af7535ee2c9d95a1d5075a71dce8c71c2315dca95587618b618fd. Chain 2 (Bitcoin): anchored in block 957766 (2026-07-12T22:25:04Z), 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/TCAHW2428120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc34dc8334c6fa79a886dfcb7737ccd43dd215c71eebf8c545590b5b120eb068d. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/TCAHW2428134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde0fa5b1f025ca7b58291b75584be409b759a4234610634e3471ffa9b75b7f48. Chain 2 (Bitcoin): anchored in block 957766 (2026-07-12T22:25:04Z), 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/TCAHW2428148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2381fd6e17b46a116cfc3bdeb9bce204b0ca0a300670d78a3e1a791944ff1a29. Chain 2 (Bitcoin): anchored in block 957766 (2026-07-12T22:25:04Z), 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/TCAHW2428164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d139bdb1a5a862ce0af8d7aa1b1122540d4d671930abfaec84f3a40f30fa02b. Chain 2 (Bitcoin): anchored in block 957766 (2026-07-12T22:25:04Z), 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/TCAHW2428174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc997cbb8bece52a80f8a1f73f95fae1e40cc2227b6368352bd04b6a09471e491. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/TCAHW2428183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2a9997a182c58e7b8c9cd156fad2ed474059af8424d953965e4a30e54877845. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/TCAHW2428188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x336b41978c8819c2dfc6e2beb3f5e3ac503335af1b2b7b4a10f330ab1a99a991. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/TCAHW2428201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f7f328c2e1c1c263f5a494bc7f0c6a94460b346f1633cfffb2d7031ba056856. Chain 2 (Bitcoin): anchored in block 957766 (2026-07-12T22:25:04Z), 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/TCAHW2428216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9e9586dcdcdbbaa84e354d459bba785b6f2873775a90d16cf2d3b5c4f9f7e18. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/TCAHW2428251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f98f24698bb1d4ec2bdc963af11a662c2182d174c2ad7f778d3f3781c21c8b9. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/TCAIC2468257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89950de5927c1e8e793b7655fb60811c29fb78fbe82d57e81c28873c14625191. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/TCAIC2468306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe04cc5ef7acefc3da13331b20a176fa0dbf7b9bec9e33439d3485284f4951aa3. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/TCAIC2468311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbbfde024f0e3568dc1d29fdba51beecc28020fa2a5e610cfe16294d5ce885ad. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/TCAIC2468327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5357968dd89c682be9ccc2a9043c69cba4f3b6138206c9dedf516ab8b4637e0a. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/TCAIC2468495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x103ebd0659386bb7ede3d0d2b2cf41c3322cc7c99107d0a6ecebdc008407fbbb. 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/TCAIX2417490.