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 0x9bf75b05a88388e0c86fa08207ba3f62c0c981e49ab1114f44f6262b6908119f. 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/02568a28-32c1-403b-99d2-5a86effa7f82.json and https://artists.proofprofile.net/proofs/artist/02568a28-32c1-403b-99d2-5a86effa7f82.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 0xa25aa1750f2564f09f39ed3ef0cff8d370635a71fd131bd8db75288f8a15690d. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QM42K1610424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa25aa1750f2564f09f39ed3ef0cff8d370635a71fd131bd8db75288f8a15690d. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QM42K1610424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87931c2d195f1931226def92964766f49dd4e12f4939226694741a3464577780. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/QM42K1741988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87931c2d195f1931226def92964766f49dd4e12f4939226694741a3464577780. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/QM42K1741988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56d731c1c8c731d021a40c1555bfe37ff59d04f1f2f0a8a852b0aeff6fa31585. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QM24S1911647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56d731c1c8c731d021a40c1555bfe37ff59d04f1f2f0a8a852b0aeff6fa31585. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QM24S1911647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaf5794e0b2b31977d04edab38705afdc10928eca59b5e3e752c919d6219c349. 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/QM42K1846662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4925d54d6463978bce9fa7aeb8727ff5e5dfa0fa7173347d5d42a0415b51a4e. 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/QZHZD1922331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4925d54d6463978bce9fa7aeb8727ff5e5dfa0fa7173347d5d42a0415b51a4e. 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/QZHZD1922331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fac41db26ef5f3253c57cbd32314145f11eade9df77b5f8bf6b6e5601d5c40c. 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/QZHPJ2055495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf79231745337ab88d2041e56d93f72fffdb84a5549576c354860d89db13440f5. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QM8DG2193696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x008651bca4c1aaca766253f50570a827dae41ab900f9908bdfa4bbb9dacfdac4. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/QZH5E2196897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe88b5f848026a9e3a210e6b666a00fe93ed103637de98cb2aefa1661f90fb6b2. Chain 2 (Bitcoin): anchored in block 959026 (2026-07-21T15:38:13Z), 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/QZJRB2103478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe88b5f848026a9e3a210e6b666a00fe93ed103637de98cb2aefa1661f90fb6b2. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/QZJRB2103478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1f1b3909bf0a50ad33cadde977a6f9fc61ad0c0c1c21f8576dfd2a57f3dba17. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZH5E2296160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b7ceca5b8e253511ef14827c1228ecb2826cdfd0775c16a1d0b0c72b6a9f5ff. 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/QZH5E2298032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50870cd88215e44cf6933a4e5d5ae2b4e6c00ff9ae8c838d6bd63fd653cd5c34. 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/QZTH92301564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9de63f0455356124254a6450b01c80c3019e74856d32d58a0351dccc14ec2987. Chain 2 (Bitcoin): anchored in block 958736 (2026-07-19T13:04:09Z), 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/QZK6P2403781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e80228aa75a946364776a1071200e6228e11aae153a5f67c28ad87e527c83a7. 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/QZWFF2457728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e80228aa75a946364776a1071200e6228e11aae153a5f67c28ad87e527c83a7. 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/QZWFF2457728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x244c42836e5fa53a640658c62ef89feb197bee421052acd6cdf99ea9d76f6113. 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/QT4K52561883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3187aaec9dc931636cea70c948292e19d42fdd0aacc542aea1496681fb09619b. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZZ762540842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cd58fb1a09d6fd49725a73ad86ecccdcb9887cdce9d9b62e5b7637dd2ee961d. Chain 2 (Bitcoin): anchored in block 960155 (2026-07-29T22:13:32Z), 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/QM24S2007349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9941313b2a74d44ca1cde2ff961a19de0d5927983e6d62cca7cfca25f5fe4d5e. 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/QZH6S1900449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdfb00808b6e776dcc8990e9746c10f07a146c2fa77e5807d7bf59b766220a0a. 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/QZH6S1900452.