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 0x0dc195525a5c4f23fe66673d98a2fa0d837291a14ac4f663d1b73af28c1a5319. Chain 2 (Bitcoin): anchored in block 953827 (2026-06-15T19:59:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/db8bde65-ce01-4879-a6d4-6ca988f65ebe.json and https://artists.proofprofile.net/proofs/artist/db8bde65-ce01-4879-a6d4-6ca988f65ebe.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 0xbc6cf195a3696273480dae7eb97995a8e10b6164f579e9b6310b8cbcad9cb6bd. 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/GX53U2542453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61fe2ed7366e0956775f331d5c7fe567353b4ed1996883f6ffcf32486243a891. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/GX53U2542454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b1d6b9d67c8c54a371bae2b4749788a5b4afab12ac5419342df57bd8e5144fb. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/GX53U2542455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a3bb718c90f9c0a8f8862d22c95683ffdaf16715712c52c7bd03aa0a7d6b27c. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/GX53U2542456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc4350233f65ed98bdc5d7da8aecb4eac46b1a37070bdcfc347d594b08469cc3. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/GX53U2542457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcdda0b975257bf63d9609c19eb3af8c0d6b11915064dd51d0d11af9c6db9ae4. 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/GX53U2542458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9613fcb0c45267a32e21e8beb8978bb2ecc526309dd878db1692a71f746917a. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/GX53U2542459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9135bd7891e1ff362b9cfb026fcdbd8ca127a7f58f274a5c508fe118e0c3c0f3. 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/GX53U2542460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbd9c968049b0dc47eeaf42e025e621e46eaea2009f75e889578429bfd037164. 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/GX53U2542461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x175e961a82047486df62af95f836f6132e278d3db52853e51c90c3e8def9a6c7. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/GX53U2542466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65b3ea8c4c630be921b0a4ee7fb29a6e2f3b0ca84e7074a0afdb875efe257cb1. 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/GX53U2542462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67ef2f3f9fe04b9968f8ac3885ba74509cf0f6622247a2b62388c58163859798. 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/GX53U2542463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f569466c1984255a771ffd435c3ea7e8d3d95ac12fb2676342108764cebe97d. 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/GX53U2542464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0edf0a622ea20b2778698d875be2acfe91d93d76c5c9d02a784289db2e4a632e. 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/GX53U2542465.