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 0xa41879a213aad21775fe6af675872ed326559ac00e1419d4db768e4d69c5b327. 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/9413049b-212a-46c7-a36c-db5ce26b904c.json and https://artists.proofprofile.net/proofs/artist/9413049b-212a-46c7-a36c-db5ce26b904c.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 0xd7bc59852d8d56d2c535e21de2b74f86636ab52e249c3c3e5a48e3c53f298c01. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/DK2DY2200354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2af17c660de202143759d20156c3ed92d9e6dba86d81e3cf7b282a4d99c046c. 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/DK2DY2300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbefe941a627f8e343f8995c927e2b5f45558177d1d69945526a00184ab586446. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/DK2DY2300356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x751f0535e66933a8e98a3fcfabd07dc5b3a4e6dd4d7c2a8099cbb13323eddc06. 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/DKF3Z2500703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef9cc34acf457e059f2c0f75f97b5c5321e3181545f175fb4b173162773b8c05. 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/DKF3Z2500704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x873739fedda3b01f73ab78ebf6cad3f9846032677544e9c897c61c8791e9717e. 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/DK2DY2200193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58ad8bde801ea52025100576b09a4974a69dd1fd762b78eb300c38b1951e6b09. 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/DKF3Z2500705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12ba56cb5dc8b5f3f7b3dd554c9cf62ef890d5676e90605410ead2863fbcae75. 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/DKF3Z2500706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b8e3dadef500eb08ede75db335928147be84d48168521015afd85fb85b42121. 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/DKF3Z2500701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x046310ad44474ac1581bb44e021f0568e18c10ccefb1429171fc98d117a9afa4. 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/DKF3Z2500707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31010da50f2635e67c74657a64d9ca9b3adfd81cc681bce3528c31d588f19b10. 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/USA2P2461026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0532dd500bc5683b47fbb2ed4d67bb435392ed97d5a9be77dc22fa4245ac2a4d. 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/DKF3Z2500708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceff3a82017974598a7cd896cb352da38e91dd48de100069083e3f2167f55fb9. 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/DKF3Z2500702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2af17c660de202143759d20156c3ed92d9e6dba86d81e3cf7b282a4d99c046c. 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/DK2DY2300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ab0ceb497440f362bbf8fe9e7aa75af56888c24a038fdade8c113f2a16d1ba9. 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/DKF3Z2500709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f2cb0adaf6ea49b6601e7ff160c9c4c79448ab034fa35bcfc874f68f84e33b6. 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/DKAZA2300355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4637b35ba61993916c923bd584c369ff42d591c35c93c35a0408021592c894b8. 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/DKUM72000566.