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 0x833939dda32ffa4c58fc39bff6cfdcfcc8d4bca6907d925689d85000bf1a0a09. Chain 2 (Bitcoin): anchored in block 953717 (2026-06-15T01:05:33Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8796cfdd-fcc9-4574-a92c-e2a8975e3a04.json and https://artists.proofprofile.net/proofs/artist/8796cfdd-fcc9-4574-a92c-e2a8975e3a04.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 0x199e91e09bf00096c310818ca8209b7e548bdcca5c8c53f487e012b4d22f5447. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/AUMEV1904119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83a0316cc4f8fab5df9ae0e0cb6831dc0397fa5ed1dfdbe96d5442688381be2a. 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/AUMEV1904120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd97d763b8282e32b5a273296feb7ebc7a973c080c84455acfe0861753d00fcfa. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/AUMEV1904121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d3379453b11f97981fa7cf4e95a15b076595755d79607ffe18f67772bc0c479. 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/AUMEV1904122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf04fc95c313fb2b654e8f274352c78b55ec9c663de8e689c920a8658afd15380. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USHM21888280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x700d4981d0a02bbbad36b8385d9b69d92064281f8424ae489c674ef529ae4f34. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/AUMEV1904123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x622fffc9ec000adbef69ff0145b9277bc75fe95505160aa181b7574295a298f4. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/AUMEV1904125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfee28df18ea86a04aff66041aed38b15210fee070584126028dde0b575209cfa. 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/USHM81829482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfee28df18ea86a04aff66041aed38b15210fee070584126028dde0b575209cfa. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USHM81829482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0632cb0fd0fbad1a3fdfbde61fff611efbf5fbfd4d3c72984a4ce636e0c2bd9e. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USHM21502363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c061ec589578ce8ab776b39010d021839ca05ee1577fa3ec7b8d40ca6bc0c7a. 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/USHM21502364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf21d587ba9099a97a1da1831486a2efe7d2234198273f5e6bc4f98a5ff19204b. 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/USHM21502365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95d86eef40f76a544eeebe16088b37f76433670aeab589c3bfd73c66fbe8a8fe. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/USHM21502366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb672bc8d85eb425c73e515823458c1761d0653c8be870d752b635dfe1bc507d8. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/USHM21502367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15dbe562277f9730fa71c8f58db4bd97a03c4d5afbda4887cbbf90a0e4b66844. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QM6P41897874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4d85ae10c1ff7c8e42932e4b67f31b0052213d95aaf76e276075a9f06a2b297. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QM6P41897876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a35a86f1da09f4ab3e3c12b99e1a54ed5cd1f1289720e6ec4de1c2f7d85672a. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/QM6P41897877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc399cfe510148857c48544ee1c7a105af34b05334bc4367e902dd3b2dc6a9d5d. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/QM6P41897878.