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 0xaa54563f8eeaa5c60b1ab45958107dca6b9d16239172678da15ab2b3635ced03. 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/d8e4232a-d9b5-4953-8adb-1e09ac91af76.json and https://artists.proofprofile.net/proofs/artist/d8e4232a-d9b5-4953-8adb-1e09ac91af76.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 0x73ac39b6aa3a9fb4bf9442558ae3e9e32aeffec5faa9d0e7a08e09136a4731b4. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/CASD10701015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27d3a1d56aa575d1e112c81e66a5730f390470596f0638942f4c79902c22224b. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/CASD10701016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b2f2a0303ff20ab769147dbd7dce4911ba20e09e208080e6b4a6996f1e5f66d. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/CASD10701020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8906d1557ae7056937ef7e502c7709b1423dcbb2a2fb0cff14c69f655f042c62. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/CASD10701021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24d9e5d70c037ac3cf60ce38858b83c0919768a4c318e7ef5b326ee6a05ca50b. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/CASD10701024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77a5334ea0ab48e312b46b55cfadd898426701779c1bf3d016aec60b1b188b2c. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/CASD10600062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b2155dfc8852c169816a8b1ffd16fac7a851979824b22484addb3208fdf8fb1. 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/CASD10600057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbd5f16bea7c2db14fb9184cb23ced8ad461271f4f428b006a5bb7829151594c. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/CASD10600067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x224f3249e462206ce3ca41aeec3a5c9a9674bedce9b641edd84e6d31c4c62c3a. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/CASD10600061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfdd21afc10b6d1d455f175a64c6069928a1b748823640eb812b57b6b03fa6d0. 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/CASD10600058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x934eef93cafcc063736e5af55d554f6631dc0422fd68bea2ed6601fc1f880b73. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/CASD10600059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c32688417594e35762b8ca8695e88e3b72b536c76b254b2293fb9eaaea47263. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/CASD10600065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x764f82665c2fd991edb7f94d0d5251b0478edfdffa3bcb7a07252f596a165cf3. 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/CASD10600063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6be924cbf8d476b0698508613bd2743570f4d8de69972d2d081ee1e803de779. 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/CASD10600066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc648bd8c9e0088e638017b4596291ef8c776ac752a9392cb7aed2819713b0b5c. Chain 2 (Bitcoin): anchored in block 959013 (2026-07-21T13:39:11Z), 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/CASD10800296.