thumb|Saudade (1899), by Almeida Júnior Saudade (; ; ; Northeast Brazil: ). (; plural saudades) in Portuguese and Galician is an emotional state of melancholic or profoundly nostalgic longing for a b
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 0x398c2b7cb0087c5529ffd986cf221b1894e49babb038b67b4a4907bc68d348c5. 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/2b192c91-01e6-406f-a45d-75f01b7b0b0f.json and https://artists.proofprofile.net/proofs/artist/2b192c91-01e6-406f-a45d-75f01b7b0b0f.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 0xbbcd6b0ebe1fd30b7ba40eb044f9a6119f959a7df5f95e24e4a22128c1946a05. 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/QZGWX2116701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb97a567ada3ca6fb22adabf645ce04fa353645c38f1e4d1684f3fc5464ca3375. 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/QZGWX2118982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb210391937ec0111c59e1e3f06e643c5a58f058b97549e12524dc61ba080f97c. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/QZGWX2128342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8c980f4c1db2977c49cd5a2399563457a25a0a1d291ba03865057e12e422f39. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/QZGWX2134691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd02f7ce2696de9f27a57bb6ec6a706e4e380d5931d48bb1df7b934dab0dfdc54. 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/QZGWX2157435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf655e9a814ad20fa6928d7c811aea7ce66fb8432111eb0008d638d0d4517197. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/QZGWX2222333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf310c93b5cd12c7fe95c2f0ff42be2f0dd8e6ab35c5f2f55179ab9ba93566af7. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZPJ32112604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3868d2df4694dfe8f79338f58a5346f2030766ee612ef4a910ee59a4dd8b5103. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZPJ32160733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e3775e79e00f71de3b8b1a3f96811226cd1f3156b88f142c2ee4a63acd526fb. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZPJ32187638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9728c6d3cf3ee315e6a572999b75b0a30c19f2dfa2ede73a1a11277505235a5b. 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/QZPJ32207085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46c845cd7e28d6b7978ebbebf1fc8db47e07f473af588e33b8314fb7e5d78cd8. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/TR0532215271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8827636063262ae969c1cd091513c340378fd3878ea774957a7e39561300ba70. 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/QZPJ32288053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x949d5e46359798e499c76a8e3bb60a4f574f7decd276ab08846cf1abf0446a08. 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/QZPJ32305732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02ee5698b3b03cc1f6f699cbd9e2baff1317b694c94c1d8e41123d44fec44d9f. 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/QZPJ32333290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ad1840c29a3ba144b74cb28972d6957cc12ea1567743fbc15a67cf0a40fc4db. 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/QZPJ32350316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26bce2a229787b0d68182dc5ce44717d9d76e4c2634b3f966cf8073325d38f62. 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/QZPJ32358075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40bc287f1d4ff6a675d124b9ca4b279c5bd5258a233e298698f017e79384f50c. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZPJ32349078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5be226951a7f6d9c79e3827552aea4460852b9011c5eb1d8b92dfdf3a4175740. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T18:01:47Z), 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/QZPJ32321910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66c0cf243cc50abd564c542a6272db10d10242ca983099577937f7f297e0298e. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T23:17:03Z), 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/QZPJ32380048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc42e218eace1be3e7098f1a1c5ee58b61f8afb70e08653ff119abccc4e99485. 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/QZPJ32403496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23b60b45d9bdb470351df2e3f0af5446207f201e67ff9cdb92ee9afcdc49fb4e. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/QZPJ32427211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12571726355f447077296655c682d2d3008669082c1531ae3aec93fecf20fe0f. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/QZPJ32430403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8ee1e2f81671c3aa30ecec94ec0b1ba0c37517fe15745d5cb7143a14a82945c. 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/QZDA82550929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebe0eec00d5bb8f4248093f690aea9b8ade97e2627ea0cf8d0d274cc3800144c. 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/QZHN52525467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26af0eb10c696396d92d5bd7b17eef76d921781cb15d882d2edd698bafa0cd8b. 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/QZTBD2556239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ebb977632a8e90c70fa2d2e4431cac026d974cba5c4d83103b182eb0fd38096. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZZ772531545.