thumb|Eterna, detail thumb|Eterna-Matic, Cal. 1414U, 1958 Eterna is a Swiss watch company founded in Grenchen, Canton Solothurn, on 7 November 1856 by Josef Girard and Urs Schild. The company is now
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 0xf8033e830840e6c5db4504dcd44d23ddb2f28cd724fe220a2276835f039f406e. 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/2ea178c2-1d63-4122-80ff-38fe9b93c58a.json and https://artists.proofprofile.net/proofs/artist/2ea178c2-1d63-4122-80ff-38fe9b93c58a.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 0x61fb7b2baf6b46f7093efa4158ba97e0e84bd3c7a2f7c95ed01ab9e311aa7a94. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/GBKPL2147313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3a074db0eeb6c1ad883a08e190b2018bcae036733c13f1f50e081d1636e6e90. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/DEG931912327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x333c2a8d367bed4dde9e0b04459ddc9c99408c4b7ed1b2ee2c4c5d4369d74065. 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/DEG931912328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd40634217e3a2757d7cc165276d11c92a86b7de043f78cf927cd71f8c64c2efc. 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/DEG931912329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa325ac036aeebd547ae891af8e034e91a59d11c0f83c94f518c2d80c9f6705fc. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/DEG931912330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5fc9f2da863727f3149c20054b8c8c645cf96682adb70ffe50ed02c3dff5683. 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/DEG931912331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82fc3bba83631b60fe235a1d5e14e1c3e67ea1b11e2f9b2b87a20543a9fdaa51. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/QZDA72394467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc747c05fb36a80ca542e27e856a0961d400bc624f26991aeaef0fe8b4729641e. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZDA72394468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31d5240a4a8f76da7c410f8f93ce2c5bcb30fcae3090e621f61c45fae212c1e4. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T15:42:22Z), 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/QZDA72394469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x426ed34b460af18afffad24a8e357d77a8a81eeb44e946a9a2ef9a7abf180708. 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/QZDA72394471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x913e3a60dac00fee980c269e2f89a011b0437132862a965bd75dd330e888879c. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:05:09Z), 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/QZDA72394473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a296c3b45fe8d165bcc687a0c9d4d6581a38a11fac24f46bfeeccb21b4e3fb4. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZDA72394474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ffdd1bae934beab5da52ad772711ef69608e643b69b72124c45df10bdda37fc. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-17T03:07:39Z), 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/QZTB22348013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fe631829a464e6b9af2d0fbc4b16a9f645ed1fbe683e2e2687a5aa5e09cdd91. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/QZK6M2414953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecaaea24708b829f4329c99934b38712ce9492e36dc63c85efe064f04b57b0f8. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/USBQU2400231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaea1d60f7badd7def5914f946b19fd0047a30514f160a4e3dde77a3eba41b8e3. 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/USBQU2400210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x986116435653dc83a7d68c8d50bfb2269959d8e0c4d195c09543cad5667e5f09. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/USBQU2400233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eade50f0e45b80a6d9d92e4cab7fbdb21ae46b14a71ea3d324784283bb1102f. 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/USBQU2400234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ee35940e06ffa37d84ff9060747a51bd80c111545a00c4272bb88a175e90066. Chain 2 (Bitcoin): anchored in block 958212 (2026-07-15T23:25:50Z), 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/USBQU2400235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafdc6308eab64533b5a54bde92b4638b133bdd6fe77d5328926891f77c03c1dc. 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/USBQU2400237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6ca81821135a1576c3bb4ebfc4cca561293bbad8ac61a444ca5937d8d8f5b1b. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/USBQU2400127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x118d3af20208516d8d5245a04ba59de574d6510940589e0af1d69244bef6760e. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/USBQU2400239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52b3ed18556ec749ebb417531a557277e4dfb9e411d41f734d8a7cf772c246b6. 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/USBQU2400240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4044bb3580438dc4a560079e15a10a60307772f6dc9a870847e67ffb7da253ef. Chain 2 (Bitcoin): anchored in block 958870 (2026-07-20T14:01:08Z), 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/USBQU2500145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4044bb3580438dc4a560079e15a10a60307772f6dc9a870847e67ffb7da253ef. Chain 2 (Bitcoin): anchored in block 957780 (2026-07-13T00:36:44Z), 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/USBQU2500145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb09ac6c9e18064a1f36185fc0faeebf73d7cb8345992fea57ec6e6d3a2475aa. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/USBQU2500146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f37490f17857223be5a1380aa97cf0a06b8949b5805052f757dd3e9f3cb9515. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), 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/USBQU2500147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a19e0367046755dc896b12ab4db887d3e07f815fa638a3e555b758e27e03a43. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/FRS182044448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e1942e5ce4c862399e744399105223a1a4cd4b049133c046dea6e753c9139dc. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/UKACT2161406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed1d5d0bf10606ee9cabf7132d3e8bd7e656661fa50dbc675029f38dd8b04adb. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/CACWV2253356.
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