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 0xf1600686f851f7b511110ef17fb2f92e6cf9a7e71500db2f1fdad90dcc1851f1. 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/ead331bb-cc90-4dbd-9fa2-5bbd4f9745a1.json and https://artists.proofprofile.net/proofs/artist/ead331bb-cc90-4dbd-9fa2-5bbd4f9745a1.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 0xb347c91f3998a5d03fa181a6529161cbb1aa10c2f1f45303bfcdc82c6569ecba. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZNJZ2190023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a859a8430ed19626890062e832bc8c788a6394cea3267636c9d7a9820fdccf7. 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/QZNJZ2190025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x442fbbacafae2d64a157652fd8ecdde8295c035ef07e8ea0c528ecdf4583ff8a. 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/QZNJZ2190026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf68cd65cbfdf70f2623947633168596ee22632ba91990b559ca4aa47695d5e22. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZNJZ2190027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa826f7b735302fdaf719f21f16d9b0f703df81c300b7b9cfb657a0ecf9e96f9. 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/QZNJZ2190028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04d7608ae856707aa1223c6a6534db45b5fa792f4c4bdf718b5941d4dfa4241a. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/QZNJZ2190029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x099980bb1041e7841e3967ad508fe1cc56ec3bcb0c1c0d9eed29038003592fc8. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/QZNJZ2190030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3307635f55df685cc31d3ea1312f6321fa80dca5cf69d935290ec2efc2bf4a06. Chain 2 (Bitcoin): anchored in block 957540 (2026-07-11T08:19:50Z), 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/QZNJZ2190031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2284a8a93119adc1a6804fe19a29e4da8e0fb91e1680e8a9ebc7a0347bac048a. Chain 2 (Bitcoin): anchored in block 957546 (2026-07-11T09:35:53Z), 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/QZNJZ2190032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x626ac7112e8fee662f873185321b73fd60a8a9f49ae42ff5b8a0c58dd1e54ad8. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZNJZ2190033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27e515182c2ea95b2eb2c7e48d697b12e7e4d0e459ef3e7a8bee347b30a8122f. Chain 2 (Bitcoin): anchored in block 957546 (2026-07-11T09:35:53Z), 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/QZNJZ2190034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8b5c9c3359d24aa1a1c90b4a1e4c45499534aee069853febbf2e8119e1eef38. 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/QZW9L2314128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1673325f20afdfcbeec24b047eb19a9f58f78ac8b069207ffa15dee1ffeb692a. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/QZW9L2314129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb84c74ee438b455195852fe88c2244b53d0786f1f60801909e00d60844224a87. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QZW9L2314130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabaf678c93c172f391ad43265f63db3c2d30cf9f55dda0cc80ece94d96a9c6c5. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T12:32:15Z), 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/QZW9L2314131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa22d774027155a48d429307cd72be32679f1a13fac16f7d51462a5a125886c1f. 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/QZW9L2314132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73b85ef88da49f739fe3edc6b840e7447160480e84aec74fb3884490ba4c5526. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZW9L2314133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2961f6aaf5b119e3c317f35d10698ffcc71ee67d8ab1cd9b7ebe29b9e280247. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/QZNJX2418391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a9ad28a4df5eb0ad94b7013bbe66bbf499fa5a0117850f26cd6ffdb673a6aae. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/QZNJX2418392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ed8e660a44ec28c111827d618265e3d4416170749e77d2bb16e421f7f691781. 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/QZNJX2418394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34e550edbb207c9b0c75213b999462c1253f244ef4b163f5af7253e4ba8ff5fe. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/QZNJX2418395.