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 0xa585973aaa9084d5619a24d57bfc4f45f385810dbd8d72be7bb2a39345d825b5. 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/012df88c-4613-4236-8342-9cb411528bd6.json and https://artists.proofprofile.net/proofs/artist/012df88c-4613-4236-8342-9cb411528bd6.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 0xa1b43ec867485e1a1c4a2f9a7720708066fbe2827cefc209bc0e6ebb79460f99. 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/NOBNB1301030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x847983475b2468d3ade3d0a4e72f4c0d4936e1679adce85da58f6a509095c14a. 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/NOBNB1301100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97c7ee0706573de521a7da43a3779bd1f05e1487eeb6aaf0ff97ee0650ec0f35. 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/NOBNB1201010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc56c1b115bbd89d2135b008f92aeda5795e133cc2fa115ad044529659f8db79. 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/NOBNB1201030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x451df286451110472524896f6f73527459bf12c98405091a059d9151d8d367dc. 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/NOBNB1201040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa06c522e4d4fb075c549d14e2f760d703068e999e5aeaa695c872846ddd75583. 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/NOBNB1201070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x135105cbf0ae824c061996807a750903f8dc273e3fe28c9f56dad217cbf92a9e. 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/NOBNB1201080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa61636b687b8359f2662d621c5c17bfe8c2da128834447cf548eb40613e4a131. 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/NOBNB1201100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x442c2db47ac1d7d5f305cb09b4f68e2a370bcd2fa745ea8971306eff310368b0. 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/NOUM70700468.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3e848d234d297467bd206795cb4cfc3b0aa1b4c3d90feed8358afe2ebea6a5b. 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/NOUM70700471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dbe407a4cf86d99af4102c966dc387c573c3d23691e8f88e3663e4c252fefbc. 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/NOUM70702078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a3399fc0cfb2054d186c3118c3c2a5aa0444754d843f781f3e1d5600baca2fa. 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/NOUM70702060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81bf016512768270102698603dede0c6dcdded974750aabe997d84cd7f12d032. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/NOUM70702112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23e2781e1e53926e8060afaa54e30e21a10febf3cd2eae8b298bd4f255eb6998. 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/NOBNB0901040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa034d51734653c85020ab5d6156b3f629651912569336b29930fd9b27c2c44dd. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/NOBNB0701010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f16b93e9e06d43f62f9455d1d33bd039170690ed7b8efb2988ca15fc90ef769. 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/NOBNB0901090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2d7c7ea676c12fd99369f68dd6f0cf35ecf0c55a512055dd6fa2ff1dac924de. 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/NOBNB0901110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa80f269418ba5222505f61fae100f5fa822767fced9975132dc964aea7a7c6b2. 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/NOBNB0901120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a2d8e2606e17c87bc21cf569b308e4994669831c6e2e0adb8674a38214c44d1. 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/NOBNB0501030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b2f50394f4925dc5833d6dbfa13b4cbe5d0bcdc874b2d199b6649d9def5f068. 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/NOBNB0301010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59a4abcceb7260bfea7e1377041cba292de73686a01754ca9108b5c716190a1b. 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/QM4TX1934870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c13ac215dd5581455f0b6f3521830494c3c8780b62532edd71f91ba404215b2. 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/QM6MZ1972927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x437020a5460e4665f94e9580bca0d34f381c4e69121849ef7083b98a07031f3b. 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/NOAMM0500406.