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 0x14aacd19e2c0afb43138655915630e2c593291f7e596f1cf125b13458ebc1e75. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/22fd5550-3ca5-40f7-9117-b1ea06583ad8.json and https://artists.proofprofile.net/proofs/artist/22fd5550-3ca5-40f7-9117-b1ea06583ad8.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 0x1304045682e2de0064ba6ead7541ba1cc23c67a24ac7e20ed5588bf8abdd0ccc. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZMEV2433547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac0a5737f14c8a4553065c2f53c62af5c2d9d245f77281c989e9465e38fcdd0d. 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/QZNMT2461081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x750cc1670bc9a50c385d854fb22c852a6a654ddc9b3b4c45beef9655c8a9ae68. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZNMT2470026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf852d7478b3e3b1a7241b06c0656c3231b2a1e814fe8dca9aad599edd9a5f08f. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QZNMT2470028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1445b82b733af8af29f34aa14cf3b536ddbf07745eb583f41d86f9973d2b938. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZNMT2470029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd149edd2e7d98771605eeeb8319860fdb1ea197fb0984864360c679dc7db9e2c. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QZNMT2470032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc282032a3a4793b5a8d7b99b4c6cfa44b65edb68350babd939945329fea538ff. 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/QZNMT2470033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c8d2e4c00b2f8e29fc2de48c17e1bf8ef8868bd00890ca68cc0ceadd0be42a8. 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/QZNMU2480489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x722854feae5252e1fbe62a35c6c7eef205f12dc29429cb46e5b29e1eedeaf311. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/QZNMZ2418861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7e419c7cfa30fc85e77bf7e8b1fd17e1e0888d5b0347403fd0dea2be7b7c860. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZNB82596723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee14be4b4e0aeb5c045e887295daecf437c36a616992446e0a7cfe05bda06af9. 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/QZNB82596724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd97dad994fa218139a9d74b5322f168609c375717f36b514cfeeff1bc4a6c4de. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QZNB82596725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91f5b44d3e027603e61784d5aa3c7a47d3a87934d2228f6e21f98dd31ca4b17a. Chain 2 (Bitcoin): anchored in block 958827 (2026-07-20T05:07:11Z), 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/QZNB82596726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32ad6254bdb2c3342797d9a8c67a43c5e3334cc01125603214cb8bd26f8db22e. 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/QZNB82596727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa0201f74a0e47342d43d51be61e3fcf0ba317db68d7e1543df3621a0af42213. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZNB82596728.