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 0x490520b5ad2366fbb6c6ff8361d7283119140cb401f8dc2e815608840be9477b. 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/5245b017-ce9f-4d1e-9042-626d16726f9e.json and https://artists.proofprofile.net/proofs/artist/5245b017-ce9f-4d1e-9042-626d16726f9e.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 0xd67ead38048ee8c7ad73d3e47a29b53065e8932f6d0a8fc5753b19cf658662df. 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/US7VG1786959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5267974516517e4d63e0480a3be7f8633d3b2220af13fbac023f4f9948de57aa. 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/QZ5AB1813314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89e1e19bd40e46c6d9019ee2fda286d0f7f4ef6ec1271b02a304e22e756f9698. 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/QZ5AB1813316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28c686a2a03a40ef1e1eb82018b3ac0a59d192bf1cd2bd11b73d22540c3bdccd. 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/QZ5AB1813317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06e74a429f9e95a48ac952d6d11753269ecd4a32144f692c9a0e6d7b37e99dfb. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/QZ5AB1813318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d0a294bf29862e21a366ecef6b431aba330f99445369ade547e3373f1c012c9. 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/QZ5AB1963128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28cf0c10f9768ba78b4744375f7694c0a2de8f985fd76f55b1b02d980898ffce. 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/QZ5AB2014268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x495fc0ae703a6d766678bb299c020e1acbfd19a1fe45e9961d4d57739a6b0421. 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/QZ5AB2048866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e48195f009366d9c29061166fa5a9c0b2f5771aa7b2564eea9c9910c8e57b1c. 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/US7VG1804118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a641303cadbe058db18768e34c629b49e9d56868115b64f891a49709095af36. 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/US7VG1804119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08f392399aed88e555b20e86decf7e00853ff09466ecbc31965affc2db390d80. 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/QZHZ41979159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe426f6e22097deaff4bc1f208b97f91be3a6fe8d1d1b723e35a76adac36cb0d. 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/US7VG1784275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3dd87010b18e19e96dd0bc4b65a9079bd813f1a8d580f5fe7b8d053fcaab06d. 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/US7VG1784282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fea9963b5a0ca70c8a9e48ec00ad4a8088e2e0b5820e6a071c1b85d32ef33c3. 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/US7VG1784288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3e8f93561d9bf7a88abbf66e3a61459dbd79939b1b7707162d260fb64a5d786. 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/QZNJW2075839.