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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 0x41c19786bff578e02a509cf088f5791faafb701e3d2a45a219c0729169c363e7. 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/59af9999-e2be-4dde-88cf-3b964b01547c.json and https://artists.proofprofile.net/proofs/artist/59af9999-e2be-4dde-88cf-3b964b01547c.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 0x270a259e9f5910ff621c7854f0d7ebbcc9a448b99c033a9bfe3bb9c6fbb6911d. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZHN42233235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f47d60661bafbfe56bbc12c304abe33b6c2688be6bac2152a66b1915be1b45a. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZHN42233232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2eae5aa3486c172110be5c2dd72bbc3476901d8dd8445974cf299e4c7f596444. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/SE6SA2281465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe61e2772f1463ada24971b1393d003b323871e84fb8357193215b526da5f423e. 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/SE6SA2244014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x368afa11460984d032320b098a859f435c7b2a30777b9e874bc5b8fc6d66f941. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/SE6SA2262302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ab92e1c2f10242176ddfdd0c19147577e9dfb6d124571ee59c3bf7cd46cab02. Chain 2 (Bitcoin): anchored in block 959054 (2026-07-21T20:19:31Z), 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/SE6XW2399907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd096ccf25d699d31b6dd7fc906f49a9766cd54a2b4e680981a5b6fd75f0e819f. 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/SE6I32424386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd096ccf25d699d31b6dd7fc906f49a9766cd54a2b4e680981a5b6fd75f0e819f. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/SE6I32424386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x044ebac4a6b23f7b8c24bf8ba4ac7d93edbd4ae03d3a38862c97bf16cca1254b. 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/SE6SA2402245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d3f604b1b7e68ab2ee132f3d677a10dd3cf57af0b386d122d52b63b90b25ff1. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/SE6XW2424006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9699b58d452d7edbdfd19f6be04e36e22eba89450790d731f802f515f6cff624. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/SE5BU2529230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1320841f5977bfeb66a80c715ffe8ac42c82d8c1c44edcddbd7e34e65d9854b0. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/SE6I32553561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d3f604b1b7e68ab2ee132f3d677a10dd3cf57af0b386d122d52b63b90b25ff1. 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/SE6XW2424006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42b6d2949a95d3cad0d5668576434cf6daeb44ed69e9fcc104f03522cf1b5a80. 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/SE5BU2528835.