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 0x8b59e8f4e969ee35c4df22ee0668824579ae9a10c920abe68b44607d7addc2bb. 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/962b0869-987b-4bae-9e3c-185129d84354.json and https://artists.proofprofile.net/proofs/artist/962b0869-987b-4bae-9e3c-185129d84354.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 0x34ca4944c9322fd2e442e1acd9c22987fcde2c2b3e24b3434279192989a14e35. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QMPKX1833472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc723feb8050899767b20f027d700f15e96fc56e57a97cc815eb7ecef9a1f15de. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QMPKX1833473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97764d60a637dda3915f8ebdd8fbf5d86b1027c3a5744df50d2d09570fc163bd. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QMPKX1833474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2bb415dec59f2b9cd8262d798587f5f280df4dc25587b40467bbd2c00987976. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QMPKX1833475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x728b8134424bf90394db295e3fe858a0ed74300bb929375f4770090c86f3cd45. 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/QMPKX1826648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x774405bae9877239773f4b1ea8a9176c0d64e78040c4509e570bd587b47aafec. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QMPKX1833476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20f20d84b9cd7e36b7517e035b8b69fddadb411bae6fc35163b20d5976a432e7. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QMPKX1833477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a399e8aad697b5e3fc856a25f7d026f04db3b014a829958543c14c9a1977842. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZES51961451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7542da459425717b1e9df016fc17c573f5474ee6d2f4cedcfcf35ee33bc20815. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZFYW1900414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc02b4119435fe198717d7a320b6b703928408577860bbe593779a6278b578c5. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZFYY1947855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7c1aad33ce4a36c481b84cefb170cb3a23bce9170f090217cbbfc892ff7fd0b. 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/QZFYY1947856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d53c9fd43b3cb3f0f3254c3275b1ab61abb56680d343ffee9e42f36277b1c1d. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/QZFYY1933661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4db75fd61717c8b297c9d734e0d658167ece814b35c054b3c7719ef561695546. 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/QZFYY1947857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8af99ec20172c44cea4d06e37355bf01417459466f7a34835149b7af6f92b020. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/QZFYY2071991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ec99d38f4fe571b9ed69a8d74dbb270e04afb3ca851fc002dc78fe162163711. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZFZ22013366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07c5886d033296a97e502fa5839173d63b4fd05493eb2d7b1c35f528ff4166d6. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/FR10S2033697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f4bf81370a1d65dd5e01d822dff20321a163be50b5bdb0df55aa19602ddcc89. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/FRX452098560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2146275214748f0372d669b48bb2d357d0ead2010bfe638447d80eba5f9de5e4. 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/FR96X2074053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc40740faaf81e364b9d5e7e0fa8c073bbe44f3a976a6d2c1384d60f4b197de50. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/FR96X2190889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1b5a45a4830aa0ffbe0af71b86be36cde7dd7eebae502757d268e9b768c1c55. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/FRX452116750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x511be6702ebfe8b0419cdad30393f4b554b30e592240dcc07a2b59f7f3a50102. 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/CH7812420889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f88f80265e6571e49179e8b25b26769283bac543759ea86559e8e0855e8b409. 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/DELJ82013203.