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 0x2dd441190310674f44a5e6c5ebc301c9fcd57edc51228ec8966d371f06556095. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/51a5a53e-2d1a-4058-ac23-71c0407722e0.json and https://artists.proofprofile.net/proofs/artist/51a5a53e-2d1a-4058-ac23-71c0407722e0.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 0x92c0c593093ea4541998b832575cc0290412ac2efa760e678a0be2dce93d135f. 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/FR6V81758488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf803abb5b6670bba86fb5b86d7ca16b08c231364208fdf5dde2a167c7bd128f5. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/FR6V81758493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2819f643cb45cdc931ef820bd68bf5cf66d7886795f42f275eb60f683bf02f12. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/FR6V81758529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60dce04ac9a032394f6c6952d003446d0c463eb13c8cd89fadcac73166728bd7. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/FR6V81758537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b2bcea135da20e0390720aee89728f92cd788e6833e22c605505b7db59fadc8. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/FR6V81758541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dbc29a72eca961b131a78a59edf5f54d3d8b5fd341e0a266123e9afe31bc872. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/FR6V88500291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x558d03c81e4e60713751cabe6398981bb75f7718cf6d2e57c07a6a40d84cc68c. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/FR6V88500292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb39205d62179011d2acd747dc2a6ef70b7a993e13b06370e42a3c17ddf56a71a. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/FR6V88500299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf2b284e6493732ac9f77a457b7a92b189bb1811580549a1ba52bd74fee2eca3. 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/FR6V88400111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59b236f9895e40dcc5c207b32d605c10aa6ee8fdbd3e4f933d6213a6a3f63717. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/FR6V88400112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4be9623cafdc7b4c3c7a2a64471cf47c56f5efb04a755814061b03c1ee31a71. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/FR6V88400113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b47f1e693c6d5610187be66acd77a7ed9d7a01707a8ac33f321c23e032d7291. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/FR6V88400114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdafd715d2a03b4698f0ddc431666fbb3b3f9b4f7883de94cbd71017908c99a0c. 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/FR6V88400115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b196861dbb21a5058037fbf75ca93947c9660cf6a148c404b6384a174f55de9. 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/FR6V88400116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95be62b870e7cd9c37cfc8b83f8e07d90cd1d047d06dfb3199fcc2bc2d52f203. 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/FR6V88400117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fc29053e1962fa1f0bf099f383243dbe8cc34a4a6fbcf260874c3860acffd99. 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/FR6V88400119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae9957d827ea51f09c4f9768e4b411367236db6f82bc694fb499537a81776600. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/FR6V88100221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ab8804089ce787d7c8ee58a776362c6dc18a8a664e89adb880e6f1ae32f7989. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/FR6V88100222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54dc7e1e6ddbfb520d4055d141cb89d0bfe7b149956a3105b3ecf84d50e8b0cd. 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/FR6V88100223.