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 0x325b9114ce384aa593cadd007ed9019f61423a22cbdf44c5623174a73af76ff2. 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/172dac25-7bc0-485c-b8cd-2604f6fe7be1.json and https://artists.proofprofile.net/proofs/artist/172dac25-7bc0-485c-b8cd-2604f6fe7be1.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 0x73e4db411f4df63bafde2aeb237c4f1b7564323c10d24e01c429e5587bf83692. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/QZARB1849301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f40052807afb7b733cd91dd4d3bbc93a7d90608cb6c37d3956a92586accb45f. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QMPKX1871278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9bbf60664b10f96962083d96adb947b310bc2c91888c83fd083800d74ff4cd9. 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/QM2PV1875514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89603364edb28f16ae208880a540f097abe0b44a018a4b47b54d445bc837b3e5. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/UST8K1811040.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14a66bda18b1337dbd2147fcc88fdbe2b675ccdf514c9b48cf213dd78bd77869. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZ8LD1976363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee8e5f1786af7049e85904c9ad53b5cc4247c71d3cc58babfdc39d26e7458f8b. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZDA71960462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0652663f9804ca6c851e2cecc5b8824f3abc0bb80d607f47c774f84300cda8e3. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZGWW1908571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56ccbc7980b51704f31b137392074ee40eddd0058e66fcdb1f443c71a3e53487. 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/QZGWW1914489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13257df0030cbee7e583020e14c96e690bfd78b8a6390823ec0697d3a4d41e0c. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), 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/QZGWW1916929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97c61abf12675a0d4ad899ec73df1ea5adf9895e63011b237490a999f101b4d0. 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/QZGWW1919318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6bb5259eda13a03e321584dc8bf564684ac7566c52a8bfb7a12e969e0984d24. Chain 2 (Bitcoin): anchored in block 958695 (2026-07-19T07:37:00Z), 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/QZGWW1979780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa744b7158cf1f3a2fa8f6454676d4db44e4de23e00825487582a408ecdc1088d. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZGWW1978345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ab8403593f6391fe04f61486d4ef7cadfde1c726c7094827d26485f24ff0c70. 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/QZGWW2035277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a02630e5df38fd7a7ff4d6fa57c434c51fccba502381658983769d2ee49e0ba. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/TCAFC2008067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09484fea0178e6bde689124b7e55452bb95ab5aea48756caa45d7e7cd819ec2d. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/QZGWX2058277.