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 0xdbb33843194a3b03171cae404abb4713a34d09921f503cab599770efcd57422b. Chain 2 (Bitcoin): anchored in block 953885 (2026-06-16T04:12:47Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0cc84cb3-0c3d-4cc0-a96d-c53fed5095c6.json and https://artists.proofprofile.net/proofs/artist/0cc84cb3-0c3d-4cc0-a96d-c53fed5095c6.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 0x8eabcd927ec50c8d24179a50ce60899bcaaefedea76bb5536facc49586bccdd7. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/DGA052084808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe409b174cd7e14ebffeeb691e765cb7277bc99084ecf3d784ec4d9217c705cf4. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DGA052084809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f90f8b75d03e2b9c5fc2e4d2777a0d54a69314ebbfe85927892786d34f410a4. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/DGA052084810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12587abccf5d23775bee91d252aa28f3e0708b5a660ecf7035d3e061ab7a71c1. 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/DGA052084811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88f8f54824f1a8649c4b1825d9fdf53ab9ce33a8db2b61cb3922fa3751beb8c7. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/DGA052084812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc167d9bbd059966858401d280d24d1069e224cf1ab5375216c47279c3a57cbeb. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DGA052084813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1271b95149fc6b66763154477fa20be3f4cf0af2e0d583c40c40b2c47bd4514e. 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/DGA052084814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6c9373986e1e872a4145a0188e814b64b6f13b3f82000457c78de24eb201e60. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/DGA052084815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89e0b36988865be9755f7871d18b07188df8777d1357451f2785f8541571cd5e. 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/DGA052084816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6baa6b19301da9e07e9704ca5a1340e57d447585eda1805b30deffbbce24f6b. 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/DGA052084817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5860e287a30e0d2a5a3f866cc8e4114b220d9b664a3c2abf370ddb5fd92be27c. 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/DGA052084818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ca7be6be3ed0ff453fcb3c96e0ae179f02a30fad2ed2235284e5680dcb12a78. 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/DGA052084819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x239563725d192d63b067a4c2fb002e31f7f877d68d30ab6a6b2c920472ef2e7a. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/HKG732267284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75b79209e16ff2f47d40c2afdd3c45ea8b1fefffcfa60af711ee2548b585ed0c. 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/HKG732041046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00d91a4e4bdf8e804c8ee6fca24b4ec9164bef0dbec6a85e2788a46ee0aa907f. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/FR26V2070130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f8c134bd596a4dc5cd3184ffb41fc18b79be110c2e22165a7826119d3078a57. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/HKC992624374.