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 0x2b20555afa808e78564e0bc3166a150aa38d777e48144965fe0166d4d1b1f664. Chain 2 (Bitcoin): anchored in block 953968 (2026-06-16T16:01:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/29236a5f-273a-4fee-9dee-12caf911d575.json and https://artists.proofprofile.net/proofs/artist/29236a5f-273a-4fee-9dee-12caf911d575.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 0xc3523d4b6468d62fcf3b49dedeb420d4f15ec28a2ce9a65f228c2d2c4861385c. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/LVL151803002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48bdaa5b1f63bce0c531bf787c4ff2dc7d34b3525db7b969ea9e25a2df19b9f9. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/LVL151803001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d6acdb7fce1836062730e00e418a0a7b7b7e6081db5710baf776610debbc993. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/LVL151803000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47283229fdaecdfbdb3cd67d92de5cba03e059ba0d432e7e6b595866a20ba794. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/LVL151802999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96093350acf54d3d4e2931655ffc5577a350f139a347e2c68116081dc281aba4. 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/LVL151802997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8ecb709a5b0e626cacd02d45e7b0fe1c6c73d03f60153cfc3dd9a76ea0acac8. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/LVL151802996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7da74a04bc0417a6018a74a270006b7ba23360c1f4b10a985ee904267cb24293. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/LVL151802993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf907ea5b4a154eae165cb97fef590dbc80f52ee9dfdb325d614d4b35977a928a. 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/LVL151802991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7db955a1c04d4f53974cd29e7ca01a6bfafcbac5fba271679047dfe1ca3bd4c. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/LVL151703853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43f565ed061dc986704e5fe001b11231d21bbdcfc97f4339e374f7812b42f7b8. 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/LVL151703868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19ad95571599e9e08617956794281982e3188ca1dc26b96fc88a016f0e6f6314. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/LVL151703863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6fe0431c07f5bd9b7ae2ea9857b3f863f85c36084539891f07328bcc2810b96. 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/LVL151703858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca20bcdf029ed381f314a8de6b7a00e66f1f77ce32776d06f8d55f9f66ec2486. 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/LVL151703857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccdc36d1bb54ab5ea9a7f7167746c6480982e0b54bd1e290ea1c3e4789b75bed. 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/LVL151703856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb06de1094b26f7151f7dae6ec0bd8651de9c216b9fc55f4eadc8f8c1ec7ce567. 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/LVL151703854.