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 0xd06266c79a13c3be8e9be4cfd952100eb05210532b44921aeda19b0eaa3bb449. 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/dd78b65f-7714-4c45-9a02-369a0d759d4e.json and https://artists.proofprofile.net/proofs/artist/dd78b65f-7714-4c45-9a02-369a0d759d4e.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 0x8426e3b6269c65130bead909f0f890058139297a449330f56df9a90507219e9f. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/TCAER2077240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6160a6b8309941c75ea18010374da6af6c8307c17088b548a68e82cb8b9e6a2c. 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/TCAES2094226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d8207e138414c091c5b2696f00a8e7825e1e2d09d60271b9099cc906d887a65. 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/TCAFB2079057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x782f89b5e67782421dc46ba0f37ce766153e5c0c1cc40311da4be935ae556948. 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/TCAFC2064527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a577775143f0cf7b8f63f0854e3cf80bdbfa576d6a174e48f3a405c227625ea. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/TCAFC2064532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10cd7747a45b8b54947c44f877dd471fdfd9d07ff5b18e7c60f927ce6239facc. 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/TCAFC2004400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76969e283ac51c78305acae50fcb290dffb5d41e190317300b9d8c2ac2140a6d. 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/TCAFC2064550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe94ec521961e11581b27a844b2c762204beef33afb0dd517b79494f818973c3b. 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/TCAFC2064557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f5c2b2c6a18cebed95f4a93b2902ecf2e311ffe4abaffaa4821ec0d741bae63. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/ITOSK2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc13ce05fec614dbe8fa2be45d26ddcd74d1570c9ef50d28a42c071fc160f2ad3. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/ITOSK2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa14fa876657f425e967c72a15221c261238e64d69d6082c0343bc228345863b0. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/ITOSK2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66581e8c2bcada30f7661624bb5bd9bff3d93d1ba2e530c9d5ec2abccbfeb077. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/ITOSK2200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4018cf8b83b3f3b4bf4e977312a84b62c389a35329ca0a3cef9bd791771e027. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/ITOSK2200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2702529e9f971362fd623658ae6c5b42d047d80d119f7bd597a584eeec6ceafc. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/ITOSK2200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36729d66344830ab10dc7e11add57503e6d453dd3292531807663aa12105be37. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/ITOSK2200007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdc06e10faf71895003468a1c2785c45e964dd7a3290641c5d4663c050f3cb97. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/ITOSK2200008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca78e137c1bd0409ea6c791422e1b4f79fe73e679f0ba8f651b9355dc5c33373. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/ITOSK2300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9028a94f06650bac39e1e8978c713fcc67a081569a9b4d32d8968293ea91d250. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/ITOSK2300010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c848c4599026082ddf3d09a86fd985461d4a76514174608bb2550bd70e2f0fa. 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/ITO4J2100019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x021a64f13c243031b5027bb5eb0ba0fbb10c2b21cc3e9416ce5a86739a6b1881. 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/QM6MZ2174739.