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 0x4f25328193300cef953795f572c0280df9871f0e22320177c5b2fc0c171d7912. 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/8d864a87-679d-40e3-9309-967ce93eea18.json and https://artists.proofprofile.net/proofs/artist/8d864a87-679d-40e3-9309-967ce93eea18.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 0x53a55da25c6b2859fa9f9ec7b11cea5a1ea5259df25bcfe4a7334a83c8b01a1a. 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/USUYG1133204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23c90e08345ab6ccfd63e201c6e518f62e9d17645c765a08dcf828a1a259eb34. 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/USUYG1133205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb44b977d8d407164826f9165653a197d407fadc514a01210db7778d74075adaf. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/USUYG1133206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77d38de2a8029fab8e22130e08f686f4a1e42940925179a2c64e04be13dd419b. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/USUYG1133208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70446aa586f74ef0b216a450c5fc728fbdc90806236ceab634b5b9f0d8e90e53. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/TCADL1858961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x345fc8c8ea7ff11840c6608eac2935c793b4064ce8ee06fdee3697c9c57dc88c. 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/TCADL1858977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8691b4f44c424c0454b96c12c33c43a2880982b40d163f4c65f4f614ccb41fbe. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/USUYG1209646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10d87c1105d4a7f528d1a15f3f9642967a79ff6cffe4b297eb2243ebd9c54ad2. 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/USUYG1209647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9eef4c1120905e7add19edcb1efa54ae40d75bca5f6344c3679a2a983f8bad14. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/USUYG1209651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc08cb61b6c17863153645e02559683aa2c88fbe76dec789a1d6d29125310427. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/USUYG1209619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x535ff6576b5aa3a1e29b0eb241101d0bdd62008d1c0d22a909b1b6ec433c352f. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USUYG1209621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19ad8695b1036b027710c1427a90b31a5395ede6dc67ede7479871ef5323130c. Chain 2 (Bitcoin): anchored in block 957826 (2026-07-13T08:56:09Z), 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/USUYG1209624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39374227af1c124e24763760ddeab072d9f6691e53ff2f7dc8190452a3dd18e5. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/USUYG1209635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x766ba22d54a9f17c65f960e2f22b5e1a5e45f3760903aee08e5bd4187d97f1b1. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/USUYG1209637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x587775aab3254c7101b4e803ed11656727826e095ff16ceed93791b9803f57d0. 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/TCADW1897495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f9d951703672fbaa798b7fce8e542da655579fc3c44f360a859e65217182604. 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/TCADW1897498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd704357dc5086592c6c6ccf372060eddf9446fa2a28b431689424221501a710f. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/TCADW1897502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd302a1b15600cad947160407ba0c20f765af8374f5decd3e28f7b3da9d80c6f1. 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/TCADW1897510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6a52b90302aa591deec1e41c5d0bfc10990159e3ff8cc8c2344d71a1b45056f. 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/TCADW1897521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d7fb9e2dff458801f0fb41780c625f1b49333f24d395299e66acbe0ee0f95ad. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZNWT2179551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8af9dcc710f2261fe9e787913b08018f74cc0e53027f9f3654b90293ab342f1b. 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/QZNWT2177599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeebe529ae71b651e3bbda7e9b146c429bf4c9449b5db53548ea7f382ee734e46. 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/QZ2UA1700094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bf0775ae215e9249c9d17b3fb0774449b5595809c32c514994faad4ffa98e9c. 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/QZ2UA1600016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x264f26030f8e5bcabd50c96434f1562a79f12743bd79b73ff7cca6209f3c81e5. 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/QZ2UA1600063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeebe529ae71b651e3bbda7e9b146c429bf4c9449b5db53548ea7f382ee734e46. 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/QZ2UA1700094.