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 0xcae678c66afeea7f16b222bb8953437f6b9965c76c58ab25915792f63c6987be. 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/e8357863-f41c-49d6-a658-715961e319be.json and https://artists.proofprofile.net/proofs/artist/e8357863-f41c-49d6-a658-715961e319be.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0x541a47bd8fe8965ae22854a57a2ba5d0e9aadf362b564c3f8f4d1767b6d50bdc. 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/QZ5AB2062257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x238d8ea82921dd88f035889c1857b324892373e8133ce38b955efdc0fa0863b2. 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/QZ5AB2062258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4d062d94643854deeff057c5778cb075b7d2b9defb9141edcfa3169e8556335. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZ5AB2062259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50a7560719351d8a77d5dd87aa12d4e6dba1fee95da5567ca7680f8a5c1a2e58. 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/QZ5AB2062260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf319e5078d9745fef9cb966003b0ae1d512c83a7533795f189595db930d43e1d. 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/QZ5AB2062261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04f547b4b0ede5d93a3f801f4ca449f5a73f39fb47e5e44939b2ab5a0f7ec76a. 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/QZ5AB2062262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19f5f0ce15929abc53d38c56feb29ceb1294c58a12cfe0f09ebcebc4b183ced5. 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/QZ5AB2062263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x920cb75f5136873b9875c256250f52e35aee1664050892ece1253f55cb7f5109. 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/QZ5AB2062264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07cada9b0cf902f531900fba70aba35903cfa9329a54e10bf4ef6c4ba08cfbf8. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZ5AB2062267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef7f8210ce226780e4b4b9e697c8a1a6a2a2723256d3a2091a2e48dc8660953d. 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/QZ5AB2062269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33149b59d819146a5c96c5e36315a60be047cf169a61aeeadfad57ed6f875b7b. 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/BRZYU2400100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c3706a1cf7c565619c048ae470f1243c10a7e23778d1bf8b80fcfed41fed184. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/BRZYU2400101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdf4a196fa4116004ffa6d5514da24396350e655197d294149dd11a282b6a9f1. 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/BRZYU2400099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2430bc9ee6fa41d2e8c1cda0e44b0e322fd145f65666f341542347b20804d5bc. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/BRZYU2400103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3ef4679a4ad5c9fbaf4f3779778132db8dd52aa91748e3ca9c3aa2ebf869ed2. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/BRZYU2400104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4054ff0440c373b1559e009b56de0fc9bde09420caabcf72aa240b099df9f12e. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), 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/BRZYU2400105.