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 0xf8c44f40bb240c0ac5f7fefd1eb6fe00bbd61cb644ee31205782c75a23bc63c1. 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/ec99fa0e-9fa1-415a-bcc1-d162f1b058aa.json and https://artists.proofprofile.net/proofs/artist/ec99fa0e-9fa1-415a-bcc1-d162f1b058aa.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 0xb0fffe8b2b2674c138a5606b241dac8c0f8f8bb2c30f203905051536a1ce370f. 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/USHM82491568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcbae362b8c6ba7ed2f15860ce8a630f69531f83c8ab530885ab451182d7dd5d. 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/TCAET2043807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x129aea1b57a8d7ac1e581e8065f7767e5b6e58f20503a4b7aecaabbebfdf7804. 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/TCAET2043816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbef1cc43e6d88cfd50664f78f5d55a3804a3c36caa075dd7865fc63f620bacb4. 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/TCAET2043820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb698211af13b3911cc2b2e2e4c872cb306582bb28c07d376a2db2db2f31250a7. 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/TCAET2043827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x871792118d24aec10f75413eedf90d6b7bf6b74520b4b6ea57a4e743ccb7ea53. Chain 2 (Bitcoin): anchored in block 957041 (2026-07-07T13:25:45Z), 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/TCAET2043830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa768cd33e9c69cdde3f6ebfdff94f3fb1c5ab6e5d778843889eeb56f9072797b. 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/TCAET2043851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c7788a3de1f01bc12c42c0ecfea9de7bce6e048ef603720588b6e8f284fe161. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/TCAET2043854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd28e782a895239c1d368f6c0d7f8ff6429cb818920f246bba482721fc7f4d47. 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/TCAET2043866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76fc356ee716927b3bdab9f2422dea85ab953031ed9ef1d0e47efc75cd31b399. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/TCAET2043898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77b50a800deea5aeb8e60bae8a82991910d081f987c4b6de066e7b99bf35dd86. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/TCAET2043908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x702d1019b6af1fee98b7dd4c60451776e5c5d719567a9e5adc31a635dfcf5651. 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/TCAET2043910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6ab576871c07d503c62098f409c3a43bf475c602852b0a88911efdbe68e740b. 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/TCAET2043917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d396bf98d4d394894ffd4a1c6785c1a5319cc841c2f67c7be1b44947803965b. 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/TCAET2043932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99e061643dce861f9fc358eeec9c472614ba9d4abc48ec0b52044fdc1b305cd7. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/TCADQ1877224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3980897f37027b70e89b20753c264bdafff91b73f06d6084aae29d5573ab6fd7. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/TCADQ1877230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ead06084b200028af28099bf38f15cdc4857873b56dddce9458bebca0c7607d. 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/TCADQ1877232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc379c983e9adb3b2ce5c24962b4b33b3f0a672799a3b3ce9a66a5f119a5400bd. 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/TCADQ1877237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a5a25ee0e26f9cd5e8a3e66cb73603c7c485874b96422589f104b26aca83cb5. 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/TCADQ1877239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1a9f51a9dad6ec1dfaac403ed9319d25ef4c3bb0a8831e37bfd9ec914633a35. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/TCADQ1877243.