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 0x88d24d7b90b3e4ce7bc5640f2509571dca75d4270931a6b16c62fb44b7fc87d2. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a1a33c27-3934-4042-8106-40ad2f95e095.json and https://artists.proofprofile.net/proofs/artist/a1a33c27-3934-4042-8106-40ad2f95e095.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 0xf51f66f8ca569ce926228499bc34e2a7640c048e8f73593e4fbb472ea7d4359f. 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/QM4TW2366247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4135560842c419742b7c1ef9d70e18b4132b2f338656a68487e33c7de8c66e6. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), 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/QM4TW2366248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b6e29c3b91df13d82977d157fb32f437803c12fb4309fc174233bbc5c33cff1. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T17:50:24Z), 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/QM4TW2366249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x227ebf833d60a53ac6873663dfa08a5a3e419014e9d6f02404c98cb1da7198f4. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QM6N22302974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ff74d88c6848478cdf159c5a0cf9327c6192a3b239f53b1e7760d98e9535965. 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/QM6N22302966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x227ebf833d60a53ac6873663dfa08a5a3e419014e9d6f02404c98cb1da7198f4. 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/QM6N22302974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a430b86ad6b117bd5e119574dd3b58b33fecc3f7b853bf209f37353590209b7. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T12:07:47Z), 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/QM6N22302975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x826e703e72007b544ce3b9da13ce65a2fff9499a96cc2aeb2a48117031be23d4. 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/QM6N22302976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36153f91a6a8e97256edad4a24edc05a4d64d80516bcfb69c5fd3449993a7716. 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/QM6MZ2305001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64594305641902798a1d1da41d34c51bf351f185b119ede6ceab441e0fe30844. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T05:43:32Z), 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/QMDA72470496.