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 0x0847a114c241b38906a69e6e724057e36e6bcf45dcfe88515355575c68c4d595. Chain 2 (Bitcoin): anchored in block 953678 (2026-06-14T19:23:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6220a0fc-1222-4b7d-960f-5416787457a7.json and https://artists.proofprofile.net/proofs/artist/6220a0fc-1222-4b7d-960f-5416787457a7.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 0x340de851261d2cfe0f2082c8aeb88082969d14910e436140c1322a6fc902c62c. 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/TR9522300306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf75bff0be75b9c423671fc698481de735d79a4212baaaadc9f414701340d9e44. 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/TR9522300309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80abdeb3f6af7a929aeddb905757f2889996c93841b71c6f431d9996b3919c70. Chain 2 (Bitcoin): anchored in block 957249 (2026-07-09T02:31:37Z), 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/TR9522300310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x118d9896a58795c69df9c3007b8d8e6dec21252148d21605481d5daeaab065d8. 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/QM4TW2322103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14bebd689006232beec5e7735a5ecf71e268a98b1bb6573e907865e06f42e8ba. 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/QM4TW2322104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x329d9c05c171c6c87b85a8abc22618998262b1b530e7bb78ceeddd9dee61cccd. 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/QM4TW2322105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x577ba59168fb9b9954b94092547054ebeca571f3c59f1081846d33fc3929028b. 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/QM4TW2322106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x821d6f1c1ff89bb374445c8c2c63f8f312c364f5349f002ad1440422e4530e7d. 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/QM4TW2322108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7274c1cb0e33e547684c1127737a9ad2e4fd99c2a0a55cb29240ef49d8fe05c4. 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/QM4TW2322109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5972e9b5457632a12a37cc2788ff31525e3423f8babc372be7c071b4ae89645. 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/QM4TW2322110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c5f52a52b3b1ffa4a7f877329f0ac60a2c69ae3fc49fb9bbac4a0db467928fb. 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/QM4TW2322111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33b5c0c811ed0458720122272c47c9e35e7a2b0c505152d3e79b68d3d3647ef2. 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/QM4TW2322112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceba08da1921fcc8a31bc4551f8e90cd4c4235e9aec3cfcc29d804cd59ae06d6. 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/QM4TW2322113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3312b846edcdc41196c64bdf82f55382cbe783dbd10b3e52ae0fa9bae664007. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/QM4TW2322114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7e479ae94e291cf701cd255bc58eb13c2d283beb1bfcf9637488f51a22c3359. 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/QMDA62243980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b23bc58eff1cb6a2f7c58c04b39758f1c345238e7bbdbfadaf09c62d7cdeda9. 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/QMDA62243985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x924e749c830abfcaec884aafe65bd82a177626c2bd5619d6c054744ff5791a6e. 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/QM4TW2288125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f4bfbe7c25c889b4703eb49e601edf1fa73970f86469a08027f6921c0bba22f. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/QM4TW2288126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f2e00e6f0887486e361a10ae2b58851dbd11dcbeb7d99dd53f2cee43f052de3. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/QM4TW2288127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x108ed87275ed571f615481bda5b3a01b0dc74e70bca0389cdb1cb419f3059977. 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/QM4TW2288132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbea3f782fdb97212a7de13ae36a13ae3e86547da1a3980a10163d8fdc0c9658f. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QM4TW2288135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97627b8500615f1e1794a460f341f9187e0164bd8a748f5736dfa6b232f637ab. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QM4TW2288136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfd72d195a38a90f998ea4a3761dfc9deb0c7eae786e6c03a74a59990d0ec5cd. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QM4TW2288138.