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 0x5a2c68d3b2a80aa882ec3fb714409d8d5150fd517d948ee9f4fc6db13ac163be. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d7f1ed5f-e682-4b4f-a578-7fd47eb630a5.json and https://artists.proofprofile.net/proofs/artist/d7f1ed5f-e682-4b4f-a578-7fd47eb630a5.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 0x69e3e1364c4bfc95fb6f55757e1780a6f5c21098b2409ba124692351cfb49650. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZK6H2269227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f8f41788e172d2376ddfbd40eacdb36781e04e94991354f2cdefbfaf00a9d58. 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/QZMEN2266912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63fbe154ffe7b3065173ed5facbffc2a6444886f6563a21eea9a17500f843ebc. 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/QZNWW2254703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecc3c5e2e3fbab079c0dcd8aeaa28ae9ae98295414c0bfc5c4aeaeca57b5d21c. 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/QZNWW2254887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e37c61174f8c1c7f814108fc1aea95d41432aa9645483169b13edddc678e4ec. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZPLS2260998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x498ea8f3892532b42a0fb7faa68eaa2430d2d7cae63b5d37b26524e8f7713581. Chain 2 (Bitcoin): anchored in block 959015 (2026-07-21T13:52:01Z), 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/QZPLS2275559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa384554ac439df7cfd10cfe79051a1c9a9d46a6c25819fc4ee9a3c5a2807d048. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T12:33:53Z), 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/QZTAW2291498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb51c90035b7a861a81edbf2fde0fc8eeca9487e63a518dc7b0730f2bd3f1e0cb. 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/QZTAW2288883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3946fff3e8e0a7a23f51250a01fc447f9ca0941c2a1ee4d4ac14d3486ce8e8a. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QZTB62235111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf98a60d700d5a1fb128cf9f57816bba95fd129421c4141cf307915f8ac8b28d6. 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/QZDA52312771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7be22f94839431896f0743fed83efa03e01ef5c177f5fcb97960b97c9bfb83a0. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QZDA52310657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d5e2e5a8e8f74698d5800fba56c7c92a1694aa4b380806416e8e51673ae7643. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QZK6H2397644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2b326f22e591363686dd7c37fd39caa0b48dee3bcb21aa4158819abecf910ab. 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/QZTB32378951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2993ef3ee801f6bae0bbd1229dfebff3e642cecf6716b6c397d1dac76e86165. 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/QZFYZ2456166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x167f82399db4733c5bed0fe03bc73c18425497a30486a04c8b41e39dc2baa01e. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZHN82450557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa93aa2e05ab799b025e1f424ecfc5135c3a12f45cdf5ac68b7e0c3e558cc0c04. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZK6P2482693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x694b48f6b13386705d6f0ccf9ecf2590a5e736ebe1137fccc2be9c563198519f. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/QZK6P2482694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b183716a895fd3f97881f03bf1cd3dce1fe81c4648b20555e1378dbcebd93d7. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/QT3EX2434674.