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 0x0e50bfbd40e05faaed85155631e7b47a25547f065d9891abd16a333d7c844a63. 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/f22469af-9296-4874-b9c4-4c1291fd5ea2.json and https://artists.proofprofile.net/proofs/artist/f22469af-9296-4874-b9c4-4c1291fd5ea2.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 0xdc1d38886d7cee30d0e304347c7f8117e836402ab104f24b04839e4a1198ca0b. 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/ES71G1914568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2295d18b7bb3cfd17247cf86c13e8149c7ac051fb31a882a17c568c8ad81964a. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/QZFZ62462943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18654c69f534facc54b58c6a381cf30ff3aa36c9b39ec7ceebe066ee57f85465. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T15:52:22Z), 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/QZFZ62462953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4740f9fe7d0433b1488c1a7c8afbd7a8d26bf48c82cc64a6eb3d00ab4037629a. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/QZFZ62462974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc332ec4eb94f0f23ec2e9dc574cda0e95ee809f00c057dc85eaad9fa09acf2eb. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZFZ62462918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22f1531606edf33f7885aaeb49f0e984d89d082655ab6b69cae91d8a78c4aaa1. 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/QZFZ62462921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94caf2ebf3c69c47ad7d22f1530bd12efc4be58967770aa8139b20a032f41ac8. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/QZFZ62462513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3728d9ea59a1e9e3149901f0c4d8010a70fdbaa962521bbc0e4afcae8c5fdefe. 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/QZFZ62462173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2282c2addb214a55f0f3c7d6d64a4e139e16bc9b0841387e6e7f44fe27dfbe8. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/QZZ782591558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3885106b804f682853201b27670eeef421f1cff5b9040308a434798fd834e38c. 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/QZES82544891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f9619a4f43c45cd62afc9cebce38a7af487a0741863fabc8a2da1d352bf8d7a. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/QZES82570116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x285c16f64ba394c4ce98ede97ca25b2c16e028b4a628ce7690e59db368a4b941. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T16:47:07Z), 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/QZZ772527100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x291d56f2fec10aff377e18705e325a6a44534ef4531b68d41532edc900f38c96. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZZ772528674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ebbd380c45b573991384f3928fc0a81928d475ef756bd30fc7219cab7dd968b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ES71G1932329.