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 0x5d3e8ee1508772559c6c442f34154d40d81b4ae16f2435ce002a6ba8af868a52. Chain 2 (Bitcoin): anchored in block 954659 (2026-06-21T06:14:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dd6dc27d-144a-442a-a51d-1fc84c45bd5a.json and https://artists.proofprofile.net/proofs/artist/dd6dc27d-144a-442a-a51d-1fc84c45bd5a.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 0xf0549afbed94830c7cca866704d2251a561a9cd0eae1a0106b9f2572241ff07d. 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/USHM80995577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12c691bd7e2918819eae5c0dd0d74cdb2a2a5cd5e37bc1bcd846a18dea9b6de4. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/USHM80995578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc185bee8953deca4dfe3465cb1b246b80db93bd6fdb651df9b7930eed558080e. 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/USHM80995579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fe092c4f4a707e2483bbcce0b19c1e9ab8008f4327c32bf7a600c0009e50d84. 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/USHM80995580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x150a2de89445053b527c2fbcf2eb5f20fbf20915e451b082d9a992730090ac99. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/USHM80995581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x436700d3ce1706e1674688f3667238b18bb21970842016711f0612f5c9a5bcdb. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/USHM80995582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66e97dfc5cbbc2a8313161ee7c46707d60fd01e5d21a23eb7a4b200670ec6fbf. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/USHM80995583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5188924fe15991ebb1a5ed8dff12a6f05afa9ae536fe46edbb1663773334d9a1. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/USHM80995584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaebb654fb9109d8f71f8e9738ef943fe5b0fdf2cbf636e1addea4d4df000633. 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/USHM80995585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c7cc9c09bb9035af421720d979f00644aee0ea6ccd2e9cc530c757891922b7f. 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/USHM90576322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c6c89a95cefbbb8699fe4646ea8774b40b7a988a3b4fefc7d2c34dbf37f924b. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/USHM90576323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c6394c3e27049731d77163a2103aab5ed1d1f1c287f6908afb7df28fb906db7. Chain 2 (Bitcoin): anchored in block 957043 (2026-07-07T13:52:39Z), 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/USHM90576324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39b317ec9c208c95de615619b69b2058f9ef5281282fbfd52b98cfb4184bb392. 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/USHM90576325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2dc2b24f09972ccf3c8271ad5836662e867f9f6a9a99e0cf29bd53d7704b6a9. 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/USHM90576326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cf3c71affb40fdab736b0a7dac75b36126d2fb7294a7f82a81f123fbf884a61. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/USHM90576327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28522289f394184832279e909366918702a2ce6f99b1b9f761bea435fa62f746. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/USHM90576328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66e7655b2ea58545212e9f4a61676efdb8a9318851dd238a2f628db2827a6fc7. 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/USHM90576329.