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 0x818b7e0a214ff4495e3d8068561d93b7415819c5ae958b1a741e231f40182e32. 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/08c83da7-f01f-4f63-9f60-b4d829a7d262.json and https://artists.proofprofile.net/proofs/artist/08c83da7-f01f-4f63-9f60-b4d829a7d262.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 0xa93d2a274208725f0e4a25c64483e7dc94259327a4a680ee5fd77c4628ebeaf4. 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/QZDA51975403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x983a40220c80875cf687846666e9ff71e8fd95e9ed9779525f6f366061efac17. 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/QZDA71991346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb91f591a6f3869c699e728d6f15eeea6b4783e23c4dab37a49ba8110275fdecc. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZDA71991347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e396fe1945e0bf3440a5c27348cef9e1e57790704100d857f1da58cf864a5be. Chain 2 (Bitcoin): anchored in block 959109 (2026-07-22T07:21:40Z), 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/QZDA71991349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1660118a6eb9286745f637c20b34c9cd4e3c1f417fc2affd4b27f6eea91311ca. 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/QZFZ52036539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2279bb00987d640b40d4e667744bc2b56b5172a53b20507e156c0384ce47c02. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZFZ52036540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a7f884acda8a95bc6b5b12a80a53d115964216926f697165e9464f5f41be085. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QZFZ52036541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c0364c0a974f29d9fe28b47f7d7a957a91596b27714e99158369a1c7474c03e. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZFZ52036542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92639ea98f9dbaba9a69969799be349a8f4c89883b664bcd600a68ae60112120. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZFZ52036543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4045704a6b8a1eb07a6a5b0ca2c7bd490bf04d27782f3d67b31a62ceef6cd2bb. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZFZ52036544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99a206db929044e96ee9395a03aed26684cf7413dd39f20b9ae48e0ba81dbbc0. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QZFZ52036546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa530fc81c416a97696f7b35e33af7ac6ccbfc9993e04567bcbdc94e2f4417f56. 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/QZFZ52036547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x982eeaec7d53c9025925ca8260653e85334413f2c0e6c3802aa988a0882a6d13. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/QZFZ52036548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e7917d73c83769fd1e0a11de7f4725374c1af71fdcb1b685a7c1ed08bcd0efa. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/QZFZ52036549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89c20cf4730271034672a0cea0750fb99308575e23725b41b9fc781672ba35d8. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZFZ52036551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb54d08abadac27c516c3dc27217fe05aabc09299967d2fdd1b3c1f4f277f13bf. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZFZ52036552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2eafa00b1e28255255422284230d088e4f96ca8c11d98a6ccedb89b82fbd1b1. 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/QZFZ52036553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbff38a2e06fda4d7dcb0d9936b61d7af1e3b3c8382fac99b3ee34b6424f54cd7. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZFZ52036554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80ad9e0fc8786808f6197f99ee361a8a7744ce7c7a0f09e3148247f9512fedcc. 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/QZGWX2116384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90181f0fbf7b63857a471e1253d4e2475f89d31b7ce6de78dfd4dffb941cdfd5. 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/QZPJ32197113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27455e9b6a42f57ef0f3504ce70719b70beffc95a89af8c5ab5625ba94c9c89b. 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/QZGWX2116383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe245c229a0f4bb5a22cb6b2eacb885e953d10bab7626f87da0f0f132e8779a1c. 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/QZPJ32197114.