thumb|upright=1.6|The reliquary and skull of Saint Ivo of Kermartin (St. Yves or St. Ives; 1253–1303), in Tréguier, Brittany, France thumb|upright=1.0|Shrine of Saint Lachtin's Arm, 12th century, Iris
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 0x585dea558125dc49a1540625fb07afceaea1a4e7421aecbdcd02a80931d6ac0b. Chain 2 (Bitcoin): anchored in block 953617 (2026-06-14T09:00:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1cb7f056-aba3-45d6-8884-fd33fa65cda6.json and https://artists.proofprofile.net/proofs/artist/1cb7f056-aba3-45d6-8884-fd33fa65cda6.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 0x65f0844150b5071073551b15af95a8b5041c4024955db579ff6a34240e271643. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/QMFMG2375659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4f7010b8ae38fa9daedeeb73be78fecb72b791fbb1aa6c641707038c6f04920. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), 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/QM4TX2196189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d431d1aa8ae6b14f7b086eb011c42ea7675265745898d2650ddb877a5589bc1. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QMFME2198647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c808dfc9b1ed1288ee25a7b1aed58de0354a3e9de42038db9173cb50aff1bda. 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/QM4TX2196194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85f3705a4babf5c503484b054a4a61067afcd461fa37983ceed7d45cf9812f14. 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/QM4TX2196231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65f537792fdb426b2d6b39fa5fd68e1f0c5c7959aee16b3a7262b0ee19ef1b40. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/QM6N22222384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cd8e3d88b33a8240951a75eeea9556e4fc666264614185a6eb1821bc1434a02. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/QMFMG2375660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b2172e6a11697179503a05fff7644922e824efba66a870e2b00c0812ebf1f23. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QMFMG2375696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f7708c92a27ec91c85c451bf21a0deefc6f1133fe343c4be520a09b21ae9223. Chain 2 (Bitcoin): anchored in block 958756 (2026-07-19T16:12:29Z), 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/QM4TX2196221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97c3e0a3a3aa8e805f7f94f5468ee8db9063f10b311d87da416131c485a4a690. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/QMFMG2375697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdee3f155133dbc6dfaf966284afb2a01d8dd88a0260c85c871b1390f923d299f. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/QM6P42467623.