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 0x96821d23a523555e79b7a38aca011b85ec224a9ab024477ca17c278e50808726. 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/045525e3-7a31-417b-9d26-89c7e2b72d97.json and https://artists.proofprofile.net/proofs/artist/045525e3-7a31-417b-9d26-89c7e2b72d97.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 0xb7d25fc9d646ba59a602ee4f11980ef869860468ade8522d184a3fc6b2a32472. Chain 2 (Bitcoin): anchored in block 958911 (2026-07-20T16:46:31Z), 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/GBHAD1000017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x727e467627ee10eeae0f95439c74e635e8755f343cccd6edf449f2e055dde224. 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/USUS11203250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8abaebe23bc6cfbcfe006e7b8a9bb029e6cb88ee88844224797521e628e2e50. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/BX0BA1900017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29813694f27cb8d2f5b55e17fc11cefccea802dc755c86cb082fde296b1704a1. 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/CA5KR2129076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7317548bfc8a53b98fa263345557951a64218c5f5c37982c89f42956159d732e. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/CA5KR2183792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca5196c6c9553c3ea2120101430bd1554a0c13007b2af2f4d5e188b5eec6e859. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/ITA061302250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x624d0474df5e7f793bae9e8cce4725f14ef7fe6e7afe6cab5b5dfda07d42c3b7. 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/DEW872205841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcfc00855b8e56b4d73cd99507f7ea76c4ad2041cff3c8b7e291c4f1ccd23b35. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/GBKQU2148509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x914a827c1f571b3f9b5cb4611f91d9490d6c70639f303cfb7dd87f01a960ca29. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GB9UU1400024.
Deeper Sessions (Mixed by Tube & Berger)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9aa27bda389499f23f6c2b6c1c3f9688cb2795c2248d7e28158551bbaac28f9. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NLF711405493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0ced9a9f5c3e6ffa1d262ebd92101a4c442926aeb87ac8ae8ca7f2eaa344491. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/QMSNZ1306773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4da66a05212db1473abd7961f5011697258aaaa20d35a62f1f5187cfc94b539a. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DEEE71600742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8316cac90254275d0ae2d2804712ff9981437a424d6ffbcb23a51c41bb9a8fbe. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DEEE71400324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d0ee02383ea31d7bf9a72534f628e849ad68bfdfe89282ffadf0fda126a3f4c. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ES84B1510116.