Notre Dame, French for "Our Lady", a title of Mary, mother of Jesus, most commonly refers to: Notre-Dame de Paris, a cathedral in Paris, France University of Notre Dame, a university in Indiana, Un
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e6b48a0a8590f5fd9066d1b85d02882463927d8ae577e4a7106e692d0f8140f. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/26b21fd4-ce60-4cd0-91bc-b0b7571daed8.json and https://artists.proofprofile.net/proofs/artist/26b21fd4-ce60-4cd0-91bc-b0b7571daed8.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe26c000630b8106130ecfad014bb556bc39e0314d180854588e728976e39d7bc. 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/US83Z2021264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadf6a146e479bca37290f5fbe9e8b07b788860c57d764038b674cd79856f4fa7. 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/US83Z2021265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd232c92a21a381d0d23a89118a3b0c20cb51a07f1d58448276b14dca8772240. 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/US83Z2021266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd77ffd122fefb089d224081d9f822999330faa3a9b075b05f71ed401b19b4f9b. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/FR9Z62000310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12e85972f0f2503d8920b509bc3215fc2807411bd0d8a0ddddce0791f3976569. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/BEY922007040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89d2737719ec54861516ff3f2fb99df341c530cb502dea9af021cb0e8fa46758. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/BEY922007042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee32b76a09fd14f916e0d384b7b0174c3e278223dbeed9af3381a11ed18a2abd. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/GBKQU2179384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b69be47cccb1bca40b78cda16822e7c2e71f41639bdd39f08fda41a5e95765f. 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/ITSV22100102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23ac20b2b544b820898b77e46f0f97a3f536af54deec02bf1867ce5c8fda5c20. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T05:34:02Z), 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/UKLVE2101065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80169b38158464ad2de4b8c1b4910678b0bd9333e774e46a8849577623d5120f. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/DEDH72200074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63e05466ec39a98c8cd5c8e5f33478c3e340f6b06b6513d0a1824197fbdc1a15. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/DEDH72200075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4044c5106c23d8fa802ad93b9174e6c35b6b491a212e3ebfbc0bbfbcabdabd9. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/DEDH72300066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfef078da9a4ec5efcb85f0f0c86fd08ef211a856beb8f0023bbc12662996b3c3. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/GBJX32005142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e4feb2781d89a9c5e473f5e84b770bd5b0d29af1fef384fa3d998c8aeab6bb3. Chain 2 (Bitcoin): anchored in block 957751 (2026-07-12T20:41:42Z), 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/GBJX32005143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc67acfea66a34c00034418040f7c4db5ade1ee869c39f6e5784801315046ac1b. 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/GBJX32005144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba45865522af6af654464edc0730469869cb03b45a608ec6deb281df3f539441. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T08:59:41Z), 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/DEY472473718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09f6ef0931b323f648cfd9544490cb78e9b5390191ad30a273148e94a61fdf2c. 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/DEY472473719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2fb959769719f0dedb492ceda88c30e6593df9c43b5aea0efbdc45368588ae7. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/DEDH72300269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e48245ca4cb15e364bcfc2d92d98aa865b1c76a6f07abe589876aa74d8bfe33. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/FRX872495752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f512755851f8ecafdd3bca889fa7843aebd2cd39b654a83309e8063e81ff4b3. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/FRIDO2511910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe92f1b1a5ab324fdc66d65a47dd66a602324d64499519d4e7addd33c88066cd3. 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/ITFGO2100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x541cf20519e320cfc406ba28a020c91bf269d82eb654abf7a35cd3f1928cfe6d. 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/US83Z2035183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6122cfbe18c791f187429ad5ffa0d1bdcbf00d78aa57bc99604bd83af4524bd1. 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/SE5R71700134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x558c139f3c7ad3c2aaee779c89acd6a4f88b17973012e92b3344e0a77a27fe70. Chain 2 (Bitcoin): anchored in block 957084 (2026-07-07T20:41:57Z), 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/QM6P42133475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35ddf414cbd22d4de41df53162fad4234d698f76fcf01608a4c8a621724c8056. 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/US83Z2221180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a9b9465f9d52800a992ff238e913430251ca44a7c23cf80e0c235d0ffa96177. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/US83Z2020683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66831ae34d2975cf6e286e60824108abdd55ff5b6107ba5054e463a3cd935b76. 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/GBLV62114196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1a69161a6331a68ed8535d5f563e6f64eed3175e3181fda8c34ba473fdfb4d4. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/GBLV62114198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35ddf414cbd22d4de41df53162fad4234d698f76fcf01608a4c8a621724c8056. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/US83Z2221180.