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 0x346f6957992ea045fe2e4e1d035ec7857d75af9ab8cc3e574d64b01cd119b6e8. 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/d57ca067-1ebc-47ca-a273-88df9c0ff4ab.json and https://artists.proofprofile.net/proofs/artist/d57ca067-1ebc-47ca-a273-88df9c0ff4ab.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 0x80da469cf2cae7c55a96befd5f3932b4fe308dc2cd76f4614bc9d5059fa30047. 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/FXQ892400209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x314c0d1d6b6ab3cb40e0b915006154ef138a84d5aee3fda831046efb03fdf13b. 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/QM3DF2418071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ed7b881f793bd0213773b792804a4a80fc6d72734c3c4f9ae3c6a90ac37f4f6. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FXQ892400029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a659be7edd6b957c8634f798efb1bb3ee7ae4aa896aa718e2376f1eab63739a. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QMANG2476722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53edc75052b078323a549e408acf954558ce10b1e9af9595357a90024deb8d2f. 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/QMANG2243130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1473bb631c67ac953be74fb0d23506ac8bebe7eca5dd91d90da1ae9b3948bc1f. 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/FXQ892300298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf6186c5b423021614251678f4e5aaf3ffbbbab0c0f02450509b2084acdb22ea. 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/QMANG2206826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7efe59af6f208a50ec229cf5959b9218235db0453c6fa705ba3bfa1018f6b77. 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/QM3DF2269261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x487581bf16db29ba0f9bee9646125575b05c29d740fa1ffa2bc8c8bd1ed7b96a. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QMANG2240040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cf03d17f6b5c08d185944244cbcf4b42ae24e1e63db68db04cef0529a1e5856. Chain 2 (Bitcoin): anchored in block 960430 (2026-07-31T16:09:41Z), 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/QMANG2222832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff8e5c1ee62642952599fff867b128c4d22eca2de5805fb96022269e36f80817. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QM3DF2273571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07198c0f2cf96687144fd7d22663736f28f70447c144b98245b1d1dd6921878b. 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/QM3DF2210190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7cef649feb106038c8254f6c49e85b87d482008a996d691c3ad526577a6c2f2. 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/QM3DF2205370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5aaec3706890de224e2a9c44324529e817645c3fb520bbd281eeed6d7e588921. 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/USANG2284319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcc7b21ddc60623887c48ecb8ea753743da7bf88221ebdd9433d7d422f5a917d. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/USANG2284320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb41a73954c22a7b54f18858b636fa06a2da94e3ee3234dd648a4e4856def854. 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/QM3DF2205374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf28c4ac28fe44ba17a4d72534cf27204c0b243ee7c787003d569d99d1103df6. 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/QM3DF2205377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91e5fa0b4ba2536efe3d9cff4393798bd79e0b04deb70b626eb6cd821eb03b06. Chain 2 (Bitcoin): anchored in block 960153 (2026-07-29T21:57:12Z), 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/USANG2259987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb33f38da65181a4185ff8f80a38d0d69b2c2158ba8e267d72f88a3889f3c7d34. 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/QM3DF2206896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8cc3fa72f3b09a3bd8a19a644a56b4a9b9dcd7ba1127948a3468521cba3e8ba. 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/USANG2248529.