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 0x9b73f40eb98390c04ea363f4454e3ce697556a6aa6697e77afa78a3f6c7533de. Chain 2 (Bitcoin): anchored in block 953812 (2026-06-15T17:06:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f69b81d4-cd60-4f4e-bd44-5059dba0fd77.json and https://artists.proofprofile.net/proofs/artist/f69b81d4-cd60-4f4e-bd44-5059dba0fd77.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 0x035a34eda49c2e6a069ae990f13e33cfea3efe79fa258169e5f05f5a9977863a. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/TCAIY2419188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4f2e79e931191b83a5b27f4a37805697151383b6b21a608409ab04b0cf45d28. 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/TCAIY2419325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1643962e0aeea3e94be64b3f3acc0cb23f09a74721795046ec273a7faa287d0. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/TCAIY2419201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26fb4590c64ded436c605edbe0907257255ab398b6432cb34848605a8a7be69b. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/TCAIY2419374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7471b1dc3f48704e500a21e07a03b44e3c1fe7a8bd6e13a164cbe565dc994e36. 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/TCAIY2419360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x513ee4338b1504ea42342ae93a10e8ae9aeb9893d8ce922814ca757993641f0d. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/TCAIY2419287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5310e6ea7805d5b9aaf776b6fb60d899632b13dea0ff49e11c2078e864e31137. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/TCAIZ2419259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ea874b2ce59025789eb12003d21ed34cebd8012eed9c1a58f9e89aa071d4ca0. 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/TCAIY2419229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe73401eccedfdcb9bf09d0c33d86ca0ddd8701e333295b8b8c401db09fcd469f. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/TCAIY2419303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x750c07e1c32832f6a3e7ae26d1f79c049e78bd5433277bc49e00816b6d88b035. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/TCAIY2419313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6378c11a33a1193157ca589095070fd4d7fcbdb8dbe8e75225d7e05f9bc1e16. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/TCAIY2419336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x628a9c53862ca662b843a9935525f9e26d829963e3f0beb9407d8cb1d0ffe5a6. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/TCAIY2419271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2ba1e96567c5db26fb002c46ccd014de2893da826e81d0b4521632c0279d43f. 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/TCAIY2419213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65e79af31a14f463bb0c9399c1997a5a68b4259af5f02bf9d45ec6eded931eba. 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/TCAIY2419242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a3253700c643d128d6f745ed14fa1a1f0cf4d814ce9b2f71bbb20e24c690172. 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/TCAIY2419387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x004340afccdd95667d0e235b5baa0337e4a8094ab23033c31681a3702f4f6a3c. 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/TCAIY2472401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9da8549b8edd4097c0c75840e8406123e397dd011b17d4867408411f79dddf0f. 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/TCAIY2472372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0a3f2bed7771dbf07c9639770c7a11ad05e03d8183c523ae661c82eb90c2acd. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/TCAIY2472338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd45c029803f1364e7abf54a83272be1107bb976b8d0aece3205b928729a66a9d. 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/TCAIY2472311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ceba808c2ecdeb9c08f59d7ae3c3ea639939fb64c14a1dd976ca309097d1280. 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/TCAIY2472387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1e2fd126dfc4f69f87b4ae0664e5b1da4621f3fa54a0e147d0413aa85640e46. 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/TCAIY2472442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x579c228c87564c1d36c4085dd378544de9f98330f586b7e1e64befa1879a3cdf. 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/TCAIY2472431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafdca799e0e60b5a5274d05887296a26833be1eba66c102965d0913b6ddf5254. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/TCAIY2472328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b9c3101fa674d58369ddd1390e2f43327d02f44a515e3178ffdb17eec528d34. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/TCAIY2472356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ddd010ecf6d7df88b1fbdc93fac943426967c5e0c4de246a27e3bdf965ffc1f. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/TCAIZ2472298.