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 0x7e7acd322ee2454e220f2760290eb509e5fea590f5006600f5ea970c227e12e5. 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/27350a23-3c83-490c-a21a-0146f7196715.json and https://artists.proofprofile.net/proofs/artist/27350a23-3c83-490c-a21a-0146f7196715.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 0x7503b6af7e9c74e0fbdc7de61c56cb213a46fa3f21d76d7d19238e349ab2212c. 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/QMDA62151271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf503babcbc4c3f3789929d4315aa34547a06da956b4e633005a69673da9c806. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/QMDA62151278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x063b12e4479dd2505cca34cf4919acb41c41e568a7e3b49b8ab0a47e2955b66d. 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/GB6CD1500021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6722752319ebe1dc0c147194c04c2b1356a436cefd2b042c3c442b640295aacb. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GB6CD1500022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x797be14a6411b66b6e859598dd7f361884646116adf848e4a27b254f252ad9dc. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/GB6CD1500023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1629a2d5d4f52a7c53b022fd3e436a25a43188d1db957a83ca330a4f3d1fa721. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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/GB6CD1500024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd290332e1683be3c41ffcafdff904cb330afdd03ca06a2fb46034c1382cfabb. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/GB6CD1500025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3867c8c2bfabe188b1746c60236a272eb11d282c21e7d1b084f640bb5977638a. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/GB6CD1500026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82fceaa9dfe8c5b1ed618cfc6ba40622bc2f4136c51650cd2140e3e8536efeea. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/GB6CD1500027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c7295899f52bb94281be4fd9836f73f97d7bf308bb50bdecfdc0fd57312504e. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/GB6CD1500028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x975a6e99c627ed7452492b96253bf08893ab2ec0499279640aeb8e08ee61de55. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GB6CD1500029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4b6d6664caa9623104aa6ac1f77088d90dd5354b619f0ada2625475709e4f80. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GB6CD1500030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeafadd23f912ba7bbfce6c884627aa251f206c17de36600c6e6798e4c01012b6. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/GB6CD2500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8e8fe12771fd321748a5d03adc2428aab514c4289b509c167e3333758493fda. 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/GB6CD2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bab2eb6e9eabd1843ec82811ec6455a8b23ab4b9e68f84cccef76a0dabff4b6. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/GB6CD2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc819ba77e6b5450b2af5ed1d6388266435707812eae27effde874942208bb6c8. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/GB6CD2400004.