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 0xd1a6d588a20943eba5874213d58e4c2c75123e721e0a34074ec622c74ab228bf. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ea7ae661-3c3a-41df-a799-a9ae77f8ba14.json and https://artists.proofprofile.net/proofs/artist/ea7ae661-3c3a-41df-a799-a9ae77f8ba14.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Parov Stelar & Peter Kreuzer Pres.: Klangwolke 2013
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 0x8dccd80609f37abf2a6cb2eb8821aa04d5364ed48724fc7da974c807275067ac. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/ATE611300041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x135478d5428a8d4c260312726290fb8cb09ffc85a7261a74e7878611ed1a08ef. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/ATE611300042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53569c5b5bdeccd65cb59458992e7893ec13b8555ef250ec594071b634c7c1e8. 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/ATE611300043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22528c40fa6f0462ab188804ff1a191ea9e2623a0938fff92df8952994dd1644. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/ATE611300044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b9ab640d99b9991ca995255ff2ab908ed3eb3fd50baee77fa3672271ad82bd7. 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/ATE611300045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3a7fffc6590d3d14a0384faedaeb425675113d1a79d323b4b7313277487f7ff. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/ATE611300046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc02d0166de859e187bd4d04971f6bd3618b2046b02e2f8186262b672a7c2eb62. 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/ATE610800015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc91450854b80b0b36aa432ca6a9b07f5307bf6624be9faa1063af1b2f8f40107. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/ATE611300047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x210fc639b1dcaf99f1162d30ee823efd75ef62c660b66af54cfb0042a93fb06a. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/ATE611300048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x516fddcabde4ccf64853fe1e0e8982d3f6b7bafce4234a19cfc4fa982790501c. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/ATE610400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c6a3d92e96a12225a24c7482687fd93e267cfbbd921c7cf3459d1fbfce5600d. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/ATE610400010.