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 0x7701c2834d1cb2780faf475d8d7ebc7a44eff3776a4e8405b184e5457c335144. 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/78a56efc-d1cb-417b-86c5-004f7968ba74.json and https://artists.proofprofile.net/proofs/artist/78a56efc-d1cb-417b-86c5-004f7968ba74.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 0xcb3e706460adeea0d353e0906c34e988c4ac7629eecf10019dd15b8dbf9d3b7b. 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/TRBRC2000030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cec4777118fd1443f8d1d8605d28628929fb717b7cfcc911909c8afeabd14a8. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/TRBRC2000032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b5db9c8df13c90cf60a6bff28526201a4476053e70a6a623bf488867d71a6eb. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/USL4R2092695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ee53134dcc99d42a5eca58db58fc395baca2e64a74ad9f33e2c43f2143fefd8. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/USY282007356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf46a74c044e3762473f4e86d0f3e917171df96b3464370479c32e58d15058bd1. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/USY282007357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32a4068a92f5c696a84f0b1028af8e72b653ccfd38749d6f16ac88fa1e37a30c. 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/USHM22142367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5df5cd27ad9f1346558175b997b40a9b43bbc4478fb9c2a69b96f66de9ae8ccf. 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/USL4Q2105293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b3f86fd1d4a5ec26a931fa01b5e86e93f379524e71bc2f2f4721b7e367b460d. 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/USL4R2150767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x623b1cf36c53ebd6d1f8824a54c370b23fd3ac08b007dab2e64637fe2d602776. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/USL4R2150768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ba4d8b37888acd60b19f2c21a6035558ed1c261d84405dba2a17c4adcfaa375. 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/USL4R2150769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd7936e81b70889d6474ae78baf2b0b78b0cd0243c15a42af6fc0fe285f75b92. 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/USL4R2150770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf2b4524edbf2af7f8e820d64a5cfd82d8ba67f424f302375e5c39c7a79fbc5f. 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/USL4R2150772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe9df738aa0f28f29b451642835fe820331e5a999d54e6865d2f17d00e515c50. 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/USL4R2150773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1e7b232311135bfca2c5d19c4b8ba5bee8195d67e0dfdd70ed2d75a445904d9. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/USL4Q2328858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x144d20debd38a9bc8de455d0c41b6487c053a3c7ccadb4d963b0f44f981dcda0. 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/USCGH2462203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd52fa5efdca2b3ca7a6d2c47da2f2adf687f8282fa2a06cfa9bcb49f4c0bd877. 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/USCGH2462204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b720bbe7d971c43a76f16fc46daddff75a9e7144e63d4ac5e370dadc97784ee. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/DEGQ82406078.