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 0x351283b8ddb31d0248cd7aa24559ca878617b4eb902dacec77da443709bfd972. 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/50c2bf41-a970-4474-a448-fcbd9b9d3a72.json and https://artists.proofprofile.net/proofs/artist/50c2bf41-a970-4474-a448-fcbd9b9d3a72.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 0xbcb13981e95df5f33aceb199c94a3622986c5d8e6f63cdc1d4fbcbe7ae9b4caf. Chain 2 (Bitcoin): anchored in block 958579 (2026-07-18T16:26:17Z), 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/TCADG1740334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1c188e45ab881e07d22851e43785b028edf7d965f614349de1e4abde6c7059c. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCADG1740336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f684890052d13f1bc2adccacc89ba34b7a4393ec5510e00f67415cb3641db45. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCADG1740337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3dd657f18279d7e72ada6b581575db953a316e79ff07c08f5a5b236306d5012. 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/TCADG1740339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93de60c51a86a5fe051fa86d2d32ea07e977b986febc6cb8c5297e07d5a07d12. 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/TCADG1740346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa21266799e243f31087b84fd99cc079599b72d660cdd8a2551e8aca20cea6d3a. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/TCADG1740333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x312e810fe4604b2106d666691db716ba73c2fbab5a97c194b1931f1725d08d04. 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/TCADG1740335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd07e8a3a045a073f4affc8094cb594f0ee01a89055b17b04ccb9c2e681739aa. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/TCACO1698014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00caffd564556e43018911dbf5099313836b3011f24169f31b3c3c93f8f35af2. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/TCACW1799629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62aae82a7d986289ec854eb91d226fb61b8115f80971bf067e04d71ea36fe5ee. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/TCACW1799630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb502c2f6cf6cc3b9c81661e87971acdaaed6e0f6fb8b8190cba7700ce15c6649. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/TCACW1799638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96a362c4b75f282539e447c0680ea562868bbd5d4332f70573545fbcf4e6e2d9. 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/TCACW1799639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9994915bd079db7693f5b25d8d9e5e07cd1d80161ca10d3ea52540f6bfae577f. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/TCACW1799640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16a90cdd9deaff58c6b18a8c77c986ee74ad82988a5a3cf193bfa877a74dca13. Chain 2 (Bitcoin): anchored in block 958752 (2026-07-19T16:00:28Z), 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/TCAGK2268143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07cc78d1813848531381e398b5aacda9680dd1697875dd8dbf76406b8d21330f. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TCABX1406734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99f3fa9d164626cd8b5c6865af6498de912212c2e0a1caee741961d93cfc2a67. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QM4DW1792471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72a4d02f221f27fcd200ee1a6c05f65b8a86d067419e351270ba23a3c0bb8579. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/US25X2302182.