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 0x10ac9cfa167296c82931399e3728694d4a21ab862d9ee8636927e19e35db3a63. Chain 2 (Bitcoin): anchored in block 953626 (2026-06-14T11:41:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2a606db2-375d-4ef8-bf73-e0dc3ce6e1f7.json and https://artists.proofprofile.net/proofs/artist/2a606db2-375d-4ef8-bf73-e0dc3ce6e1f7.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 0xcb58f468d83926ec155e1a55e4b44c473706ebc5cd7f2b74f13e0bc5d90a411d. 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/GB3NT0900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e7b583b6d59c704b3096134eb8fd4aeafe461b9cb68c3d3cf5b2682096b9435. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/GB3NT0900002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5c4e8f9c7bc2b1aeb98fb2024a8129fca053838c327612a47a1c3788a79b6c6. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/GB3NT0900003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b7ce95a4a7faa2f487cf50ede825ccfe8f9061d4dd1ef40ebe4b8ece07d9ea3. 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/GB3NT0900004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66010fdac5ba7b075b5e0b96ea96ecabb7814931fa57672c27789b42b4edbacf. 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/GB3NT0900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0833d1539d27aeb95ef6bd41ba49424e6a87bce51a3dd8b3ea214e2ee58cecb1. 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/GB3NT0900006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90e9209e1950dc79701ad6660ff601cfff0c3cd2368a573508acef7da80769aa. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/GB3NT0900007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7690a28c7fa98718973b38a444d8d65a3d85172df17aac982639d31a7a8eddf4. 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/GB3NT0900008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a7e2121d34fcacfe0cd0f2536f280dd76a9e5c18abbd8c79f298a99e61a8c2e. Chain 2 (Bitcoin): anchored in block 960179 (2026-07-30T00:39:11Z), 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/GB3NT0900009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0125d788d5da6a36c84052f234e2095cb4ae2cb465aeafbf360aeaa0206bad1d. 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/GB3NT0900011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd80de629259877d502bc315df764eb702651e94cc407bda80b9e0a955bc810d. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/GB3NT0900012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51ed3729cb3f9739d6c6a5d40fcc23d61a42afbe497245342e0690e9e443fa6d. 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/GB3NT0900013.