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 0xc7df58f947654297768aefb30f23f9b5e3ca2b0a5f8ef51e31a7ef910cfe2815. 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/a9088be9-a544-4512-84b9-a9ad928e02dc.json and https://artists.proofprofile.net/proofs/artist/a9088be9-a544-4512-84b9-a9ad928e02dc.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 0x554fe568bbb11d173e56467cbfc76994ac38fbeb2c75722772d2a4fa86d9b0e9. Chain 2 (Bitcoin): anchored in block 957599 (2026-07-11T19:42:17Z), 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/QZES71992815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2e9592ae2c898aef7bab08b01a64d1941466ac3fd531c94adaffd0c11610a4c. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZES71992816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e4d792290d4a0c7886fabf8aec3f2d719630d6a4ff524e5897c9c05bb0bdfe7. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/QZES71992820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x863839bbce9393b827e4759d6fc0e26449152ebfd1667e057d1dae4d52380ae2. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/QZES82057218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd76582fa836695845c7c8e0d4b4dbdf0d24ab4cc609ea02da60fb9f65f4ab7ef. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/GBKPL2138776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84d5c2eb8fbc6bbbab9d7d111c4714b188699e719f497bafcfbd79d3e8d99f79. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/GBKPL2154299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x387d4330b6465d9c068ec5adaee3c69aecddb4b8e166a7ae75d009051d1c19b6. 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/GBKPL2154300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb419097d98285b45840f4e3caf2fca6137e56bea7e172d963c1f580d8c300696. 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/GBKPL2154298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd76582fa836695845c7c8e0d4b4dbdf0d24ab4cc609ea02da60fb9f65f4ab7ef. Chain 2 (Bitcoin): anchored in block 959146 (2026-07-22T15:41:47Z), 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/GBKPL2138776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x387d4330b6465d9c068ec5adaee3c69aecddb4b8e166a7ae75d009051d1c19b6. Chain 2 (Bitcoin): anchored in block 959146 (2026-07-22T15:41:47Z), 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/GBKPL2154300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb419097d98285b45840f4e3caf2fca6137e56bea7e172d963c1f580d8c300696. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/GBKPL2154298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84d5c2eb8fbc6bbbab9d7d111c4714b188699e719f497bafcfbd79d3e8d99f79. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/GBKPL2154299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaf4cedc62f08e3b1cfd093febcac8ed363847b85baaed30eb5363c6406cc62b. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/GBKPL2171065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc865e356def048a71437d70d937055e454f29f8ef941f6bb197219dec9241db1. 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/QM7282374317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9709e3b57f9b5a5f66ddcccd1204c7347e47dfbe068a238b99bc2dcd3165fccc. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), 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/QM4TX2440382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x876bd07c21328c5ea3ff391accee1d8823a3651fd954e097e18da65ff0f90973. 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/QZTAS2391348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c96c60aaa59e09c5f4013dafce82cccd23cb2079a4fcf68709a8ebcea8a6cd8. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZW4F2212348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd37bb1c57c785ff17da482f2ef6d503a226011f2e6fe65ab836d2bf44149f2b. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZW4F2212349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9fa5c360573a8ec0423b746b8aa02d5080983cf282eed125e787329cbd89be5. 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/QZW4F2212350.