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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 0x894d84fe43e3228a8c7ede3a6e84abbb65e7227b5582ec5a6d718bae705b2403. Chain 2 (Bitcoin): anchored in block 953667 (2026-06-14T17:49:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/55e4f2e4-bd44-4e67-8c3c-6cad6bb9fa7d.json and https://artists.proofprofile.net/proofs/artist/55e4f2e4-bd44-4e67-8c3c-6cad6bb9fa7d.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 0x54caeb5c08fe8673a0d4d2f4e5fdf696b20a40e43f8046d7ebc2f05f31a660d8. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/SE6UI2100101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc60454e87c4d8680ba9f30e8a53014c7e081598b6a594ab5da53a4e8fed07e01. 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/SE6UI2100107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07c2099a534bf894ba0950c26c7d8956b7d0e43abeeb478d14d226eb38100730. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/SE6UI2100108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e26ec04a9f1dcec9ac293301ab416607be73f5f7e3ce4a0bc99cbb6a0ef62ba. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/SE6UI2100104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3be5692d163620dfc11aab87f81fa64487aa8a0afc4cd99bcd5c9724ef27674a. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/SE6UI2100105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31c02e4cf0b7c4ce6e6c39922407c8cb18ce9914ea83a7f60f94ee24c313a5e5. 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/SE6UI2100106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed325f0cb5ddf1d580df325f1bfe8161b68c554dd1278f66327cee17180245e0. Chain 2 (Bitcoin): anchored in block 960339 (2026-07-31T03:13:37Z), 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/SE6UI2100103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe78863b0023c5af7e3d72242f9b48f4ee882ee12410aeecd2ab8d5b809d6ef2. 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/SE6UI2100102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63e24d33f1ec463af7e876cbbb5e4f127f773e37ffb6e359d34045b468195cfe. 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/SE6UI2100109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04579e6fe910430c713b55d84787ab6e48a3ca708d6d5645970656f229ba1823. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/SE6UI2100110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b207eda02668e77d7f3403791a42370195c866f917be2fe29cac31cf666241e. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/SE3EM1200201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37b542b391f46617146356d14b3c1cb816561c70b56878576b749ef063c83192. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/SE3EM1200202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7f5b71a1ec336fa2308555e7034022d4106a6dd909c500473336cc8bf94e767. 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/SE3EM1200107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b39642c2a4bf8c1a189295896048956151531d961c4c33d6438fb8a6921ee33. 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/SE3EM1200203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67d42f842627586d25559e0368e45c1b7e81304a69ac8b2624a8d369c95ffaa2. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/SE3EM1200212.