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 0x03f7d4663ad75d54e2f46d3efcdbdf7a194a81f7b30ff843a3041ecc0cc1683e. 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/e9454de1-6f84-41a1-b49a-3996a2054249.json and https://artists.proofprofile.net/proofs/artist/e9454de1-6f84-41a1-b49a-3996a2054249.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 0x359edf85cbef4befaa93cad757c81a5036fc12903ee94c0031620a4703d61019. Chain 2 (Bitcoin): anchored in block 958474 (2026-07-18T00:59:09Z), 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/QZES71814752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfefe2d54ed77daf2776212e5d3e0e0ffd862d67b9c3e24c1f58426cd82c61e54. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZ8LD1988734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5d7f587b31fa80b0b890ae399c24257a31b3be3e986ac76b7bbfc9c62ad524a. Chain 2 (Bitcoin): anchored in block 957522 (2026-07-11T04:46:56Z), 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/QZES81887478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12acaed600bff9cb62f296cd54895f338bcf7dddf64ac481fa9dd663bf8182d4. 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/QZK6M2089881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0223fc3abb715c851795a4aa9ae3168b1f200fbe48fad4971b21c0e9bdebdf3e. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-17T00:52:22Z), 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/QZ8LD1988173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x002a04cdd190a296612c7a9d4b305054e0ea5f601deadf7bfffbb9ffbe85d094. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZDA71937634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16bb9acde772a9691e9e865d2c5bb0178bca34b7c61b6262ef28a46aba5344fd. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZDA71937636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77319e671c22e6f7353673b3a22807aed2c5c8bc110fb17753f492c446fcbf76. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZDA81958689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed176dfbffa2880ff3c6059be9784482dd218561f5d240c33856f692a91547f7. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T23:07:59Z), 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/QZHN31914270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe95d5c2bc6273924d623ddcf3c034e484c1b11034ee6338ca267f930d5ade90. 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/QZHN71975541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad0ae6c74b0907662bdf9fdb82b917777b12056aff99075b5d45fe4a856e88d4. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZNWQ2089763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa829f9cdf5b68458e45588ff04e814974803b26c03becc50519742ae057b4616. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZK6Q2135372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48d366ead81f1337f118b3fd262c6543b8eb59614344db6ad64a6d2af0a93490. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZK6M2176640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0ab1adfb68e041d719c078cc798e489b04feb0861f1a7ea00a72cb6701567ff. Chain 2 (Bitcoin): anchored in block 958590 (2026-07-18T17:28:56Z), 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/QZNWT2193146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf628d25b228aeaf18149cc077b9e4ee1afe69043e001d9fa3089a433c3a28a34. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZES92207620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75755ca379873799070ba05210a6dc54c7fcc027dbc6d988d2cac7aa6c2f76a6. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZK6L2217949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b46c73547d39a34a6305eb14e0c5022ab15169689644f37c9b1340d29f31cda. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/QZFZ72331951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8396431622bfa767efda1916132bf1bf50ef4b4871fa992538bc8170f982e3b9. Chain 2 (Bitcoin): anchored in block 958399 (2026-07-17T10:39:51Z), 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/TLVEM2429248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x087dabfcc7cd9684daac5e97211bc2521a082609a42d2180404c8013899063a2. Chain 2 (Bitcoin): anchored in block 958380 (2026-07-17T07:07:02Z), 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/TLVEM2429250.