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 0xa6793e2ce6b8297a4eba0e1571f5f9c1ec657ad8cc8c19b1c5b87cef60195797. 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/972ee195-eddc-4f16-bfab-c9ef2eb48add.json and https://artists.proofprofile.net/proofs/artist/972ee195-eddc-4f16-bfab-c9ef2eb48add.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 0x61784405586682f8721f5fe2a85906330027860846f521f42573bd6df697b082. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/ESA012431288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x127f141311eb4e9eb8eb1c55a590674785f4ed7063c2a32f8f1bbbe3c4fd600a. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/ESA012431280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a3d5ebe41107aba269fe5cae5b1c25636bef8f7e30e029c2d694ae3bb018b84. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/ESA012431281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d0cc7fb8dc5d91f7dae673be0743d2254d72242fcd530716ccc1bd31b44f095. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/ESA012431282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x758398888dcd3d4516253a8125b5fd316de070781946667748d0bab7c2d13963. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/ESA012471798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5454b55f0049484879c2c3512b889db7023b12c766885bd158293f138996477. 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/QZTB52501512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2905f3def11ba681fdc46dec86b3303d4281bede681ddc4b3049e6c334cd5001. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZTB42589052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98b80547248a9e1918309ec25acf626376ee96cf3d80b7b2d7cdcfa26dd43edd. 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/QZTB52542842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc53c0b5dc5eeff4b768d75ab553c10498b9f44c36ad58506a5bf0c626a885cd5. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZTB52530972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd95c5264e79d9f13570f40cf68d62de86d284b6b6c989f2cbf7b9244f450af75. 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/QZTB52551281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56e309c7a1e9f630542b3350646bca515d88b4f9e92842a32c2d4cb2b5fe360e. 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/QZTB52544872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1223233952e1311af65607b6a776d6d026987d0ccaf62c678c0ece051d3254bb. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZTB52597695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x108c84c626ceffa060d082c74c487cf04a87b590cdd5d4a5794b99bc4787b38e. 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/QZTB52597694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e0e6b83a36cbb421f4d8bd580aee999a258d0215c21fa76777c7d2c1b7453ae. 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/QZTB52595463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bb3a0b4f67a4471da847729cc98c306e2db8a5e0802369e0b78d9e960716666. 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/QZTB52589433.