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 0x2311e098563cccd4de2c2c87dc854d68a624b260a010cc361dcd867b9f09d0ce. 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/31737713-5f77-4321-b8b7-c4df2d8104b4.json and https://artists.proofprofile.net/proofs/artist/31737713-5f77-4321-b8b7-c4df2d8104b4.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 0xc4e50a853a4c202d626390675b44b26316c4a7dba6d797ded43c286f29ce26aa. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/SEUM71401240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d208d0bda63fe6a2a43654f20d51eebce2cc6827ce00b73ac8627a9a7988604. 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/SEUM71600834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fc027397dc27d270438d818df8da75279c29aa27b6bba7a9ab01c46cd88b36b. 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/SEUM71400617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5428afb1f52190a893f80597929180fc659927a6dec325fa5df0290599a2b5e9. 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/SEUM71400624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67d9095d2bf75a6388bea1103cfddb9889010972600eb4e916d9fc60f893a3b6. 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/SEUM71201244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e58b58a5a8f8032319b8dc5467e89a43ed7b8fe8e7c444e2be026f9aed9d18f. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/SEUM71201240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dfb6c725ba46eb29f5d860f1a08f676997cf7840313207a08057f1c0762ed7e. 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/SEUM71101050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42c010d522ac900e6699762bed3474c95b0e3dbbe840626c5b046d94693fbe75. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/SEVQF1700101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaa3a86d5ca3af98e0f051fa60a15dcc37907746ea414c9464c72a99e215554f. 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/SEUM71700385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66725b4226d6528413335e29824db5f88b695ba5db01d1ffac2438007e9bf4e2. 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/SEUM71601808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x268817eeb2ba8e8f75e8c91674cc6a89aaa6adff0bd59462b5607707c647fdc5. 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/SEUM71601810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41e38af54910ca750e2829f0e4386a34ca73bef93a8e7a2919eb6fe10dbb8b9a. 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/SEUM71601811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf020d77e7c98a1d8be3621e55bc6e91e0d786c482b037b29c508d2fbf3379b0c. 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/SEUM71601813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5414f685e9233eba014cf0a0f98cef95963e54c7efd87a297274ef54ab3ffe02. 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/SEUM71201238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x325176e44987747f662620ece8f27a2b5643395d9128b80b2927827636143320. 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/SEUM71100581.