thumb|upright|Medieval battering ram in Italy thumb|upright|Replica battering ram at Baba Vida, Vidin, Bulgaria thumb|An Assyrian battering ram attacking an enemy city, thumb|upright|Replica batteri
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93d91231c467ef2f0bafc93c5ed45d79b1f73557a5856e7ef9a8a86ecac5aeca. 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/3a92a477-d716-4f40-873c-513d2ea82bc6.json and https://artists.proofprofile.net/proofs/artist/3a92a477-d716-4f40-873c-513d2ea82bc6.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53f2df7f39e94493ad9c2087d36d09ceea89472ea4974b222764147f82ffaa31. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/SE6181900101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x593ff8455324ba215edcbe9d4e6137d2b7bb5551f81498a8a73fb101dbee0a58. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/DKB2J2000504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4ed469f0c973b38230d41a11973a56a403976e46722113f41f38cd266760d75. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/DKB2J2000506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96fffcb8ef6c47f3e2e6fd0caaf78a100fb44fd85c95632b7e4be0caae18b42b. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/DKB2J2000502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4e4301dae1d3a35e144a8f186f0b4160807e640429072d46b8561b96a8677c9. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/DKB2J2000503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf92edb13736dc78b11bd57ec4e8771d5642af882a69ef3db8e4878af42fcf92c. 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/DKB2J2000501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed32b01e2c77ef3fcabc646763340258045bd37a63a7aa26c6feadb851e2340c. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/QZWFS2410918.