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 0x5b27963ab637e6049566e544f33ca44dc86cd2e9b3417bd49c14a1e505211c1c. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/21cb3d04-7f6a-4199-839c-e5832aa550bc.json and https://artists.proofprofile.net/proofs/artist/21cb3d04-7f6a-4199-839c-e5832aa550bc.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 0x5353675954552efd1143848815a49f03f88be5cee42a98bbbb2d98147037a3c0. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/FRX281941575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c544ed7bbfd6373bd13b9def1561375491635fdf7b9c3744992cc8b4cd4a206. 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/CI2DY2100298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1b4a00c9f6ca705acfe2568c5a85ade120a54421c1de66fb31301d5f4ecdd10. 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/CI2DY2100299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f9f811a90079d25efc01cc596b926c271154e8bf86c068468587f06a5268c9d. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/CI2DY2100310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1e7ff87bcae2d4f09c624a29066caab066b1fb90f77757eafe122fa415afab4. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/CI2DY2100308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x664a6f0ffd7ba2db26d17521cf16ee620d118c303374452b23c17fb7ba56d7a8. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T15:59:27Z), 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/CI2DY2100293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2eed9b85200a6e2f55736c547cf72f1e2b6e7f75df2b487dab1313c508d71fb. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/CI2DY2100303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b546c453e9e6cb25df7cb8c22c6c30382c370f140f6fe752fdc6407287867f3. 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/CI2DY2100292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c544ed7bbfd6373bd13b9def1561375491635fdf7b9c3744992cc8b4cd4a206. 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/CI2DY2100298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1b4a00c9f6ca705acfe2568c5a85ade120a54421c1de66fb31301d5f4ecdd10. 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/CI2DY2100299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2eed9b85200a6e2f55736c547cf72f1e2b6e7f75df2b487dab1313c508d71fb. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/CI2DY2100303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe92b38e4d474dd6105ab502a0cfecf72aee4e273ae038b65fabf5180270e2fcb. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/CI2DY2100302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x664a6f0ffd7ba2db26d17521cf16ee620d118c303374452b23c17fb7ba56d7a8. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/CI2DY2100293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfed1ab7993863be9e38303f8c24550f1ae40cda2d33076e2bcad0795e363d29. Chain 2 (Bitcoin): anchored in block 957839 (2026-07-13T10:06:30Z), 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/CI2DY2100294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfed1ab7993863be9e38303f8c24550f1ae40cda2d33076e2bcad0795e363d29. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/CI2DY2100294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45806001de6ba6da3307f2a7c0e21c1d5ac948ad3f537e3eab64a4b48c53167c. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/CI2DY2100584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aec375ace466d34bd9cc0b43dbd52463bab764eeaaf17649637c3888577f773. 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/CIUM72200020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aec375ace466d34bd9cc0b43dbd52463bab764eeaaf17649637c3888577f773. 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/CIUM72200020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c49c08401dcdaf6d806026527c2f4531decd75bc06a3939c7313c4c22c5f077. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T04:18:14Z), 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/QZGLS2581196.