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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 0xfe869956043cd0f249864a3094702372549ae079d93dc9af7c2994bcd434a2db. Chain 2 (Bitcoin): anchored in block 953762 (2026-06-15T08:21:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b7a5d924-af5c-4a5f-a724-d3472aa93e86.json and https://artists.proofprofile.net/proofs/artist/b7a5d924-af5c-4a5f-a724-d3472aa93e86.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 0x5d4ca81f4db554553c14aed64de4f04cbc8d950299127e31f6e3c96da2fce672. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/NOCXR1625020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ec5ecbb1a224ae0b680a67330e56af6054447550b96d5afcb96a8aa9251354a. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/NOCXR0903020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93df13b8065534f7562185d3ba06279377f51b30c3838532293ae5f3ab06c896. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/NOCXR1108020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x024b0132af3447134d20fc06e8a3ef4f72bf40ee32c12136c19038a415d64707. 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/NOCXR1108030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x618a4fd75e4bbf1a3fd7d6968371519c065afb970460bc246f8d7121e85e39c1. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/NOCXR1108040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab266d025016a3b1df9d99a40948a02567db02d895a9e47b1ba4a450561b13ba. Chain 2 (Bitcoin): anchored in block 958903 (2026-07-20T15:22:45Z), 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/NOE9V1701010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab266d025016a3b1df9d99a40948a02567db02d895a9e47b1ba4a450561b13ba. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/NOE9V1701010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10db42188d3b1ab41176af0d2d6ebecbd8d85c2cec0c16d88f889db3337bff81. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/NOE9V1701020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf52bbc17ef21e798cdd35aefe1779a8c37c52f1d775d25d41c0840b7ec8d3848. 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/NOE9V1701030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9216f225adebc88c318eab06605a98e5421e5681700e2faedc8e0d99e22e577b. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/NOE9V2001010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2c1f5453e1c861b20a7928e0502d7bc96050993c0dde43e6f8142f475abf36e. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/NOE9V2001030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa56d6a3c7426f7146d3d8471400ef32532c9213f467f7385a6f545217784d983. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/NOE9V2001040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9216f225adebc88c318eab06605a98e5421e5681700e2faedc8e0d99e22e577b. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/NOE9V2001010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cbbf2a85590e0d9f4bc2a17c7e353904a60de1d77d84d2678634fb04f5faa33. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/NOE9V2001020.