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 0x99528827403afd6747ac836977d306913cd11dff39c041190502f205cb23c068. 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/55f53f80-00fb-46c3-a287-f5249a409866.json and https://artists.proofprofile.net/proofs/artist/55f53f80-00fb-46c3-a287-f5249a409866.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 0x67efe4d650aa8b8491134be35567c42ed50c34ce0bb7963a00ebf764feb64958. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T07:02:32Z), 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/USL4Q1804905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7332c088cfa49cfb36696e58efd9b1fe5612c8b37057a3e8b6352bd6167d344c. 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/QZL3X2000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa67e0ee5440d86d79e51fa03a3aa286354fa871c2382bac47cb523bf5d47091f. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-20T01:51:45Z), 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/QZL3X2000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c09ade35376013b9e105fa5f3684627d5ac91f4cf5d64aa45a03b8f5ff36820. Chain 2 (Bitcoin): anchored in block 958682 (2026-07-19T06:17:12Z), 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/QZL3X2000005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe852320d57b30725c1f7859eb3934a7b98452465caaa80c411cd137ab8f2fdec. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/QZL3X2000008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b735ea63ef172756bb193ac9e54efb48426f17a0874229fcdccba54c86dbac0. 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/QZL3X2000010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x452ca9f9c6e996fa4ed4c7341c16d36a9a27194c6d963bcad08c319f4ce749a7. 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/QZL3X2000012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b735ea63ef172756bb193ac9e54efb48426f17a0874229fcdccba54c86dbac0. 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/QZL3X2000010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6fb5809d926082f5490548ef96e30de61e1c2fa8a2872ccfbe4071d6c13d70b. Chain 2 (Bitcoin): anchored in block 958666 (2026-07-19T05:00:30Z), 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/USL4Q2390525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1b2dc9d3219f9d16fec5575206eb4ff32d7664ac3aef3a6a19b8d7ea2ead335. 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/USL4Q2390526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f309f887a64b647b8d27e3386853bece387d82d702561f35c347dad559e8409. 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/USL4Q2390527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0210333b4833cd99f2c493e75c8e9ba057e906a762028a41151a9cbbdb52383. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T09:03:37Z), 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/USL4Q2390528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd49b52604320e2c5dc735272cabdcbc22e7bc58bfbb73bfda07ae2f58af8016. 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/USL4Q2390529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb2a4b03d94a2bd9ef90b01f44c1b77cbeee0728e0e9860696933deceff7a2bb. 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/USL4Q2390530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcce97febad270fbea4adb72bc86a33c81595ac62dbd9f604ba647af1d3409d9f. 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/USL4Q2390532.