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 0x6989c9d72022dfaa92e9ac639c911fb6792bb2e20e8a979c078bea7d2be998d0. Chain 2 (Bitcoin): anchored in block 953660 (2026-06-14T17:20:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/521950d7-5b16-4dcd-ae15-08361f8eff9d.json and https://artists.proofprofile.net/proofs/artist/521950d7-5b16-4dcd-ae15-08361f8eff9d.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 0x00771722bdf07e266ba0f03f6a60e8170ed9b4f705421967949bdf00e290fedb. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/IDB662000096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ecf2f8b8a729c191f200ee42c5f8ba58159a3d68a246a1dcf9d95ba6f858af3. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/IDB662000080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf82b2b52044425ee63626015055753d4a004e5a4713b33baaf1314f858d3fa4e. 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/IDB662100226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x054aeff0c50459b481b48c06e072b5c22152b15d22aa79b23a04c3e5a34e0b0b. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/IDB662100228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90c1c1d8745584c98edeca900694e49248a681eed8434e2a5163107d42e1178c. 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/IDB662100234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbdf69f90b2a7b0ff13ba8751a664eccf791f34b148e83ffae0749c9d0ba8c3b. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/IDB662100365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a4048717fa4d8d7b42e84776a78dd264046797650cd7371d629e51d7c4c9b14. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/IDB662100377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a57e8507ff0932a89c0195be908b0792857194115f4011b242087979f2de56c. Chain 2 (Bitcoin): anchored in block 957583 (2026-07-11T15:53:17Z), 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/IDB662100371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66f7dd30958152f4e286868d490514507f9881bfbea77f1403abf0314094c1eb. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/IDB662100416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x630046401ee5a6be95ce8767bd5757ed38aa9f4e6570973a3edb6c276b7b2e37. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/FRX202145492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb88f9a9f9fe75f3a8b7806d66a47f8c6441c5ae0f68a096b77cb2fc32277d816. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/FRX202146853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54da59fbfd4e4a7de3fe5465dc4413385609d87231483ead4b109d38ec3e8de9. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/FRX202155511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83f1fa0085a4eea628700247f83a95e7fbb8acfabf71b42cf49755013c96994e. 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/FRX202155698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde6b5e53c37a6cac0cbf784e87f4e1893907183c89f2a56720ae1780b805f2f0. 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/FRX202155510.