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 0x9230b6ec000ba130755def04dbd86c3af3c05df8a645d81659a1dd5b971a85d7. 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/f2d16a81-5700-4648-8c5d-b8f85837e0b5.json and https://artists.proofprofile.net/proofs/artist/f2d16a81-5700-4648-8c5d-b8f85837e0b5.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 0x501b735a5998a22aeded756d30a2c5d044ca6ea43e160f23faf1d1e54d626e9a. 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/FRX762363134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6600c5fd2c0f5fdb26312ea0493b18af94c4233ff3433c7c2d5bc13893280148. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/DGA082377033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44572cce671296fd657c96f1b1f206bc43bf5bd85fd9c39932673233208bfc68. Chain 2 (Bitcoin): anchored in block 958116 (2026-07-15T07:27:32Z), 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/DGA082377038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea904e0ed938bfc5198135a59c13768fe53ea49f474df5236be09d659b505569. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/DGA082377040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09e630f3dd41ae7b76924d12dc8623a35681fbde8f7762d8d4c3aa820224d3a1. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/DGA082377041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd024a62324248b7d5a09bd70cd994ca0c0d4fd367426451cd97fc38752b81cd2. 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/DGA0L2450449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a7e1fbf21702c7ef047542bf2d0daa6242f7b1559dff592fead40e31cab4f51. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/DGA0L2450450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7d56ede2d6bcb34e8b47357b4ec3135a5e124d1ac6756827bada8be7fe6fc93. 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/DGA0L2450453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddd580c0da2db32834848baf2d3fb57339503ef7ebe23914d7f0690ae08fc487. 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/FRX872510759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f65f07ea9c130fd796f3efcd0028f91f3866e9ac41e8e5a2b01e42c429f6f4c. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/FRX872510760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1a8428be01d895ff82a1e244e5d72ae48770ce0e12871b9a1b996f7f3848097. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/FRX872510761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80f11a9ec7916b50d7576921b2641b480149089fe0c0edb1f2de871dc41bd10c. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/FRX872510762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef514bf3f1dffd5b08817156290207aa3f0377e8c646f515694516520b4308eb. 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/FRX872510763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x739f72beddcf421b3e77d8c4702275dd960ed43893a8447cd55d2a8fdd126c64. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/FRX872510764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3cec87740aa5fa87d4a9282c6ea16981cdd014e8a24c9bfeb9cee4ba4cbe4a4. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/FRX872510765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc642a709970022ceb1cca7b1cd9d7144b4a955f34b3cd5cdc2817a163a933469. Chain 2 (Bitcoin): anchored in block 958535 (2026-07-18T09:42:49Z), 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/FRX872510766.