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 0x2d25fee21bdc333031b2a170315e0d6a56e76367878ce296ef77e039054c6e33. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cba49a38-007f-4190-90da-062f9b4a5821.json and https://artists.proofprofile.net/proofs/artist/cba49a38-007f-4190-90da-062f9b4a5821.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 0x1f30275fa4edf0bdcdba2cf70fa7197b98bb2864f8de9e317120a27145322dc6. 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/FIT131600009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4114c3f7a0241d5bb69cc95d5a08232d3359dfb789c8452be93f47ba19c76238. Chain 2 (Bitcoin): anchored in block 959026 (2026-07-21T15:38:13Z), 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/FIT131700011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x346e52b7bdede67c3ae5b0bd314f6470b9aed42ef184e401b6784f5b085740e6. Chain 2 (Bitcoin): anchored in block 958705 (2026-07-19T08:43:25Z), 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/FIUM71800277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86004da53aad7e4534adf84cbe9cdeaffb2e1891cea94e24b67b59167234c090. 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/FIUM71800436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3656376cb71f1d3e001dd27e5cdbfb6666de4197e2f55cf812c7d66638dec7f. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/FIUM71900166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1144b5065d9914a5ba24841eb537889a32e9c99f422cecb39deb5a6119ada73. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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/FIUM71900194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86004da53aad7e4534adf84cbe9cdeaffb2e1891cea94e24b67b59167234c090. 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/FIUM71800436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc046fec11df74bd0cbc114e1279e7e32d8aea23340df4cf3a2a6e4f68dd5ec17. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/FIUM71900195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3656376cb71f1d3e001dd27e5cdbfb6666de4197e2f55cf812c7d66638dec7f. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/FIUM71900166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac249974f187d5c90aa2041cef97ac9937fa43803594cdbf3ce7209ff2cb61f8. 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/FIUM71900196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb300e0bbb7a90c8a477d7c34e664b4931ce39832f1e682b55bed23f123950f71. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/FIUM71900197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fb66ad140d30d875751e1bce84eb9d8e63a8bdf17f9c9045986e9903e528d4c. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/FIUM71900468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0fb252426a10f5c50654a8b247d69707e152c0e9efe7bf182e326bf9bc7ac3a. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/FIUM72000375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6c4a23a353f91c772a6b81b411dece2d08137c7a6f55ab8d51f92b83f7d76a6. Chain 2 (Bitcoin): anchored in block 957863 (2026-07-13T14:41:15Z), 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/FIUM72100228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4bbc0315d80b3d9b238484eb4d070e984d43daad3d4c3806eb3df6acf9aa574. 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/FIWMA2100192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70eda141fd188641bf0713167f163275d567989f619813b811c3987d4c58a28d. 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/FIT131800044.