thumb|A street in Oğuz thumb|An aerial view of the Lakalaiva interchange in the Tampere Ring Road between the Highway 3 (E12) and Highway 9 (E63) near city of Tampere A highway in the broadest sense
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 0x312f4bb7dc11e05a92678386a1fc6fdf8284bcd974f00fe1c138494f36f4c638. 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/a4345b59-62fe-47c4-9fdc-a24d85f76fab.json and https://artists.proofprofile.net/proofs/artist/a4345b59-62fe-47c4-9fdc-a24d85f76fab.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 0xff300a255e3313f9a98576e425a0dd6c50ed357c80b021fd4e7919a51903a610. 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/QZRP52164534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d7feafe08007f7824dafcd1d8d2665d8349ef6f3e30e9b715a70790bfec976b. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZRP52164535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x137d196f1049a9119bfa5921b90b09b8f569317348056b72bb8cf03631a074fc. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZRP52164536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94e3464d5916d308c8e6f7e2b93bb41c8fc8059a4bca53bba513b411e73acb0f. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZRP52164537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4e73b254a0b9ede84b04247c851dc9df273a08e2bc3b7cc15abd22848f6d933. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZRP52164538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6910913dfb4767413852bc31cc3451809b2250616778f450f2d7f393cfc9336. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZRP52164539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e0077cc9bc8dd0fa199b690fac75387d75eb52e4a26c7d0a076c89acb35888e. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZRP52164540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa14b83e91e3536b0d577157cb91922738ca66451aa91b69fb692dc577c8308b4. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZRP52164541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8a07332551fb768e664c33344c570f37628928f6062011ad6dafd96bb8dc73b. 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/QZWFJ2335698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d88ee97fd01f070d05abbc843c001400efe6981fa9e410e87d2efcf4e759e6f. 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/QZTB52318606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f569d11769f442e10c0e859faab63aacddd295b4d4a02883ac93eebf61eaaee. 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/QZTB52318600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6e3df972b1d09e118d3805fc348207844aad7b9a8bc969371dc57375f94d859. 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/QZTAS2336015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x012ef33f23334f6ec1c72d8645c47e3c26861f8e18c570667508c5f6a85cdf49. 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/QZK6G2337953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac9d1f962ff0af9abc869aea73e652710424dcfa5499377fd60d1973608b4945. 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/QZHNC2366446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x952697d78896543e617a12b454de3bf66719726c90f0a041840cd8b957171930. 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/QZTAY2247157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x232760360904873d4811ec3f7fd5b816d7a09bb93bbba973748e30301eed33d2. 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/QZMEQ2223832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8bd0115ade9d2761f6c618a76f417555da3d379d0d1965d0221ffff0a89fa9d. 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/QZES52267883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16cf5eae82f46b2fd5f688cec65dc9cd7dc6bb9579343f074c0399a86247eb4a. 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/QZFZ62208106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x112e3de6ae21311554156384fe499c0f8653daa67d80ee7a8cda74bd3051cc1e. 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/QZNWZ2198441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b5a64bbcb4879fa014b6f014bc855b816267b9f3c30783ed940685b854ef5cc. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZNWZ2128360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0d4d2b1d95fda5ab090dfef72714544a6f11c4a761dc64ca21d4b3bdfb57f98. 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/QZHN32170072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14eeb2d792efff64f116f851bec3c4b1db9d090545b921ae21272253ce14a096. 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/QZHN32184149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ede5987196f0f9078db0bfd280b307bce45c98c950a18657423da322ed725b2. 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/QMLNB1800030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe60d3590faf8ed3bd50e69deddc14f14e91d236396f71a749277531735be7d07. 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/QZHN32172549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fd63d1d43acc9d9acf2ef8bd30bc659b3ca0257b2c920ce1e61fa34fc1fc5a8. 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/QZHN32174090.