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 0x2faa87cba5065de9be3eb1ba87febdd38703d1e90b48420d7d85d7666d0ed8a2. 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/d50ef462-a878-4bcd-a531-88d45864f4e9.json and https://artists.proofprofile.net/proofs/artist/d50ef462-a878-4bcd-a531-88d45864f4e9.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 0x203dbfaa2ff895e5eea23ebe19e2c223240d4d3e9af63776b6e2d1ce952a91cd. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QM4TW1653611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94ef52f05546ddf500c7cdf95e3fb01d5a9636496f8de3f577a94930dd5dc91b. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T21:24:46Z), 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/QM4TW1653616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b75dfb862e65b415808d5cf9c927501a15620e0c34ac6db9987870a0693a15d. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QM4TW1653617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3b5d264882ab526627a5a5f8ba71a33ea778c841a1be18bf969dc783fbbc83b. 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/QM4TW1653618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa66f81a94a165eb7c367dc4fc958e663122293086b1bc54c5ddfe13bd39b1ca8. 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/QM4TW1653619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cf1c2d2bd646a920c55234182ae3651077424f6a1edd3f7b9086b3c6627eabc. 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/QM4TW1653623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd345598b2f65b649c531fd7b4c796552d2ef5eba4b39eccc0e5f6c11a74eb5fe. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/QM4TW1653624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ea2464bd74fe464796582066d7a44e585448a18956fc458744dad81940078b2. Chain 2 (Bitcoin): anchored in block 958212 (2026-07-15T23:25:50Z), 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/QM4TW1653626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40a526bea79794de7cd74c47ae65806fca3d9ac0b5099c4099021ea8a6cf5299. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QM6N21976914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4fdec23385c9298f0445480fe150c1d7ebc9e7a4a3e448f06968212cbddcedc. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QM6N21976915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8fb5c2adc6a8cc29205ab7277b642cd52ebf5d9080b4eba5e35c8d833de610d. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/QM6N21976916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba78022837bc3aa1877f71751ac706b3c155e43f12b30a4defffda1d5d07ad35. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QM6N21976919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x622ccb3e3be8a2548584167f5639e9e2dc69cedc7e7f518221bd2e82c5c8d62c. 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/QM6N21976920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01d40aee8d629e5f5278037e09b40606c83c45cf21af5f87ad01c238c283d014. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QM6N21976922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe77fd2dcb9ec126f77aaae9759247b965dd84fdf9be65c4aabb833a5a228ea8a. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QM6N21976924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ef5eed245f9566d5d00cf9e0664580c2df91033266328064ec82750d19d3b01. 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/QM6N21976925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95d7a2b2017dd252f7b4e9032bb745376844edadc1dc7d24e1de9e7265d15d44. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/QM6N21976927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e4272f18a7a7daa7cba6893b044bd86aab4db3c36649b36a6a4201081a95066. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/CAM460405890.