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 0xa8a8bf8bded82b3b9774754d3e7e01bc70ab8fbbb9bf7afad9d20120603f1c3b. Chain 2 (Bitcoin): anchored in block 953592 (2026-06-14T05:36:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/06511b47-77c0-44ce-b758-e57d5de10432.json and https://artists.proofprofile.net/proofs/artist/06511b47-77c0-44ce-b758-e57d5de10432.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 0xf31c6b8a9fef9214000adb69e7d0e27daa9c4c6c7d9cd1b8233ec1c5c26bff85. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZZ7W2417847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacf11a3a2d38436ab2013047bc929f0e57d7667f42fb3c6388d189ea6b089ed5. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/QZZ7W2457394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99bcabb3e635d72afc0071614732f29d400caa0345b3ad2b3427482da70dda1f. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QT3EX2406363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8a92400ba4cd467907f7a099b8272b1c65622a82e9b8db6802d9d1a69728693. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QZZ7W2493453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4132287ff822e9fd4b657335d5f80d9261a35dda313108ab5ca671e7ac08b1db. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZZ7W2481029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x622901ba7d9d3ab2e0c4137c90bbe680bfe05f4a860e51c2c0f1e3ac24a4613a. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZZ7W2490967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x949c8ca570a4e4b7884d2605182d6fab5f826d82b7a04845b66e3678aceb8503. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QT3EX2445915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29d33fd45c52f9b7461e72bc28b16317a39b29566b25a876f1042eb8e8b2af1d. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QT3EZ2405175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e899785a52b8630c4ac3a4c41c322df8ccdf9bd37dc01e5c5507110961246c8. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/QT3EY2410495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e6425688c470e4d73deae44e0979a4910871de3e319341e4a111747596281bb. Chain 2 (Bitcoin): anchored in block 958830 (2026-07-20T05:30:12Z), 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/QT3EY2412961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8524fb08dbb8652df73b26a7149cb3050421dcaf277c70a3568ef4b3eda77079. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZFYX2526678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d2a3a0ff06511882e31e1d4ef828f61ab20adc00bfc830db65eb8de1715f964. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/QZDA62578811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5e933793bf51c2628e46abc101d706908e417a7cf9b65f8b1931860ee4707a3. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/QZES52528678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa66abd7b735cd83cef2b9672162112dd1ace1264d40e47d92163bff984f23a27. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZHN42505876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cf195143296b9b4cfb048adca0240eaf8af4fa121e3b2a4c68f5edbfa54fe8c. 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/QZHN52595220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07df4e0c131c47fdaec34f67abc5ef105bf853891401557047d830702c43805f. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QZK6F2531805.