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 0x36b69f2c4d097759ab4b226717b2421fe59dfe115c49565ecbbdc7ec3faa4233. 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/ff41179e-0629-4cc2-8f58-a06e409cf300.json and https://artists.proofprofile.net/proofs/artist/ff41179e-0629-4cc2-8f58-a06e409cf300.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 0x28010033138679a1a48bdcd8111e9af49e7f6f50c2aa1bcaf2517994b5410252. 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/QZWFP2351686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe314e1b54b09828b588cfa161668bd97923520bfb0256271d36bb49c26923546. 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/QZK6L2318374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb79561929668c9b424e42aa5daa828b7b4c14161c5346ed41bb65053118f0c64. 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/QZTAU2419041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf4d74552a79dcd17e04cdf2abe03270ed204a40fc740a280fbfaa055335ad1a. 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/QZNWV2482020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2b39685e5f34f865c88898acc8993ab6a1318b2b6f25b2407cf938df796c352. 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/QZMEP2475321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x742f663b8ea71bc104fa23f52caa37d98e412cb0830fef910f1a6574937cbbe9. 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/QZK6N2409068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8038fa8dec46ad76e15d3ffb0cdffd24cd4c95f383d2a9ae0f6270d3491fd26f. 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/QZHN62493178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x215b34a1407ffeceb50319bcbb59bd810c60aa24d1c1cc951cef16e47c158468. 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/QZES62436047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe51b402e2984e0fa79009d7581131781ac7f4c1e17ccd925ca4afe7d7fe5a6ac. 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/QZWFG2354208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc3adc3b448f36de1de16e80c255a5673476bff0183a3ad9e3bb06d3e972983b. 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/QZTB92392195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6efb5d185235c75442cf0343913fea85c73d09b2087eb8710e3906f2af461080. 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/QZTB32383082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff69bad18c485be75027c6b88ef591d715de7318fd80d412f7c7e7d6fb01cc8f. 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/QZTAU2377162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b1033d564cd10cb6c34af5cafd623087452ccb5f910657a930e604b27157dbd. 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/QZNWZ2327708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0566a8ee8029039b854ec61628c791f0ee67845e7c6d7c474f8f8d373a06699. 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/QZHNB2349724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x655a1a5655ba428e28f9ebd473e5229685baf93d5357abba212ed44f0914ff4b. 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/QZDA82398763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3188ce5ce4617b910b2b5709c2172fe577d342f93c4ab3276875bd21a9005680. 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/QZFZ62353587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11a58a3acaa78cde9f5c72cb25631807d3b48165e6d45fa0a32575a55b445d5d. 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/QZTB82282716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16df9fc99803addbbb4366c7730422233a3201f7cd2ac30a2988431a5898f316. 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/QZTAX2288483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc470851b080c9906c60916e6dbf8e1e6febe3061c9efc316097b3e8eb2300dae. 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/QZPLS2254899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1b790e498991778ab5b8ede1609789dd73d7e8373d99a4bb51d0328e3b1e082. 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/QZNWT2247066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ecf4c21be51db94c11afee9e434fd9ee7260ba0ca8e778df9472a8409847719. 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/QZK6F2291494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x236574c6185002ec9eececf87b0d11f49de11ab79af138a6be39e0fd1fdcec5a. 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/QZK6H2205871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5dfd552bab4109f25b2018fa2c5d6303e8f7a4656e9f28b2c94181869cc76d2. 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/QZK6L2225670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fd7e1ee069e3fcff22437dcfe66b7a4ab60706491de05c618284b8988368b42. 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/QZK6P2251137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a6ac99c1f0edb2d70829d05961498bc677db5da2acf18f592b8fd279c86acf1. 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/QZHNB2295418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac8e318c6640052c45e1bd94cbd0ee969ee7b5cb873865a6f15576cb9265553c. 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/QZHN72233538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x095c7eb071f748dcf1eff0211432dfe6b92573523afd1aa0d77bd408e83998b7. 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/QZES92209530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebf86f87e1c7d1a8263418061c224ec9e2dcdc9779dcc09d78bbc3eeaef7cfb4. 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/QZES82285731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05ca6223293f4567b7fce3dddd675418bb35a8f4a202b1bae17f2f5dcd40444e. 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/QZWFW2413445.
Columna (4 Piezas breves para oboe y cello)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69512b59b9878139720b8460cc41a2dd080a5a80559d0ef05b4b3cae34171d80. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZZ7V2457553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe845c98d5d45d89653101246c1d68c186ee9ecb32783c46869e6244592c62a67. 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/QZWFH2445353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90a9ca12c6551b0403e021d8c464c227fa0175b3cc559f05ac9c0f19ed30c977. 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/QZTB52409251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7050c67f806b5a128a24d9bd793c960b579ad5cd4c68c56d3e4b79731893a046. 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/QZFZ32523428.