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 0x574ad6ae23433b1a2f64060bd77b333f0c34af4fd6b75301efc21f2c5197cd6c. 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/653ac670-a7cf-4045-83e1-57ebf7292fe8.json and https://artists.proofprofile.net/proofs/artist/653ac670-a7cf-4045-83e1-57ebf7292fe8.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 0x1a33e114e4a5f82b65f325348382632ca8161e0387558e59b5d43c2790e5627f. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/US3DF2268017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d10db22ec7d11ccf35314e34cdda8e51e41f2034223ba2f59c80b6ea50329e7. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/US3DF2295145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa06b81fd6afee26e52577a0d6400c326750e4a5babeab498d5e7dc48e528d248. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USANG2255124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x876b3e6ad02270d1846aeb54cfac7bd2766445dae1c6e4451eb0e82352dcddcd. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/QM3DF2211198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc380065d1fe2370c49f80656e7484fbaed9af36df745839b32afb735382a1678. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/SE5ZV2325201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7507e12876f6fbfd3c8cc7a02489705961406690154fb91203286cd2c7b4bf4f. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/SE5ZV2329201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf919c9737c198428625704c1c12d79e0821936199162f702b13bbfcfe8535068. Chain 2 (Bitcoin): anchored in block 958988 (2026-07-21T09:08:06Z), 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/SE5ZV2332401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb87fe9bcc36936ea68776f43c4eb91a2d9996047541d31b50a6606a537d54a5d. Chain 2 (Bitcoin): anchored in block 958680 (2026-07-19T06:04:14Z), 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/QMANG2255958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a6f9eda043e411e860bc2916be645e56ed6a9290129f61a1d2ef347fcedabd5. Chain 2 (Bitcoin): anchored in block 958988 (2026-07-21T09:08:06Z), 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/USANG2424729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a6d01a942541986bbe407e31dbe8c0713d200996bc9c540762ffff5f2c6e18b. 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/USANG2446084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa214b1939f1286336f000c75ed2c42e4d0c11e39aad39c2b363eacf56aac6618. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/USANG2466959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c85423baf40a7b2c8ea9a8e1d76d29a45d909aeb2c620577658ac982e652891. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USANG2488783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13b705938877b4342eee5d1d50bd889bff33f1aa6bfaa29bc8bcb16b989b615a. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QM3DF2405506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d0b69c1d4b858dc57985de310da49ad1a91530adc2b1027a40426d12cdad307. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QM3DF2420649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71777d7bedfe1fc0c99fed8216994fab5393ce11baf1c5618365da89c6b9c282. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/US3DF2509702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7823869278c5000238a5e69f5d6ee6083bbee607adeaa70fc516e761b7d2838b. 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/US3DF2526768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94042ff18254fc346298176cc81a7f7b7b2ab79ca99ec9b1502095965e503ef4. 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/UKZGC2401969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabffea3296dd06a0504e0bb138e9339f800117bd72049a91793482b621fcd832. 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/UKZGC2401973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x809f16bff3fd264eef518404bb1116dd3834d0ef5ef5c528d742517be640f2ad. 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/UKZGC2401977.