thumb|upright|Beethoven's autographic sketch for his Piano Sonata No. 28, Movement IV, Geschwind, doch nicht zu sehr und mit Entschlossenheit (Allegro). He completed the piece in 1816. Art music (alt
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 0x26398d16c1f8f573301017e7e77c861887f98ec6c13cff9c46daccd93876b859. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/926e536d-f610-4f55-a337-d4932806e46b.json and https://artists.proofprofile.net/proofs/artist/926e536d-f610-4f55-a337-d4932806e46b.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 0xca1477533cebd078046bf0945ce403ee41dcdc6d4d3daeef59a3d2a36cd4f4c9. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T02:04:28Z), 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/QZHN52201513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x808feb0507909df6ec744d00b2c85be5917eaf0ea427e32d9561405dddbe8ac1. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/QZRP52287688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a90721389a662a78a5d10a44db86cb2523486a39342d40e22cae197a9004f4c. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QZHN72379237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5b7bc26f05208c1faeb8c29738ba68d23230616073fde9259a72891f6ac3677. Chain 2 (Bitcoin): anchored in block 958945 (2026-07-21T00:35:28Z), 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/QZK6L2351126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fb7333fde065900b8d81ae3db3fdde4b5a711cea999fd7b0159f030e2bee16d. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZK6F2322552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe31e230f04d268c68a7106c6c9f0bf0a888b8de352bb2d6281bbeeeb386d906. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZMEM2313296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f43b7400ae944c906a0798bb5905d1978bae1f0ecd3f5a1ce624e3169b2c97f. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZRP42335252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef7e3080f471c76f63fcbb5df13fe777ddc3904464bb233c40e4d949966b11c0. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZTAT2358416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf99766f3ad85806cb3cfea64cc65346bfd2b7ae58ccd1f41ae71e456e04e2a65. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QZTBD2319929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb7d09089e0067056c49a9145ffbcead738f253ce5e07842631b53f2f598e095. Chain 2 (Bitcoin): anchored in block 959010 (2026-07-21T14:00:08Z), 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/QZTBC2335668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd7fa25d6d96419c913b2a0ade5f9f7b3d667e66b5770bc1ab80839b88b5eee7. Chain 2 (Bitcoin): anchored in block 958668 (2026-07-19T05:16:11Z), 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/QZWFM2388539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69a453f567185e74c9b23afd3fb699a640354b3e3d90e575e6582699c7ad05ba. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/QZDA82433336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd603d1696fadffc18351c83f223388aee54b4d6208eff940e5f7aec0b5d7707b. Chain 2 (Bitcoin): anchored in block 958696 (2026-07-19T07:45:31Z), 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/QZHNC2462133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32b429b00fdcef0a725a51d6a2f31c8f3ba688dd83f899e1159d0a2a9e5fadaf. 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/QZK6P2493358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc2f057d2e518744130b59fb6321fac2233eff96b5346c2fde95309b480fdc88. 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/QZK6N2463703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f052c7d422a4590b127453e174426866ee51dd83069ecccc6cade2b8a5fec42. 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/QZK6G2472499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0de85f616eed0983a42d511b183daab584ca86cc93538c6ae9cbd9cc043983c0. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZMEP2471221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdf816d8f96af6af404e2dd3eab409d4eaf565bc61d3879d5347bb0907036542. 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/QZMER2438527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf4d33a9199f3170aca49822eddbfae23ecafec347c6a739b3167ac59def918a. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/QZNWR2488183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dabfa17ad733f8550dc9297d200fd726575ad07632d9486ad16b154526bf956. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/QZTB92403240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b4a80b46d26e6f19ffc645f63371dd090f32fe81dbf678f77827890fe825b96. 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/QZTB92485579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ae605a94381b1ba6f0842352e3522d701e79ae72c95213bba42547fda5d2dcd. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/QZTBF2481992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3a46ed8cd6e4566315e891bcb74b74140e9b24450de7ee83cfc5d94ca37ae6d. Chain 2 (Bitcoin): anchored in block 957633 (2026-07-12T00:19:47Z), 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/DGA0S2489115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ba695643eedb77a2703527c25b41058a9a933ebc055e257c754ac003593144c. 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/FR10S2509115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb097beefa469fa971f09a5654043c73fb2ccc3a50ca030bdacbabcf44e603f10. Chain 2 (Bitcoin): anchored in block 957638 (2026-07-12T01:56:41Z), 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/FR10S2535251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77f8ffc7a7bdf21a4acdc404ce0f9701d2cf21170253d1fa12a3de6fdd67c760. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/FR96X2567656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd104979e4997f6f2fc4a0d2b2a4cceb49a12fa747b78970234cbbe0b934da21. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/DGA062529785.
Instrumental Indie Folk: Music for Focus and Work (Indie Folk Central)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8802a5c4a5f9264b73374779c9d78ccb94301f44d2510106db5c828356315c0f. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/QZK6K2415872.
Sweater Weather Vol. 2 (alexrainbirdmusic)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24afef5660e0682490d6f519782dcea8d63d6a8bc6ddaf5a9a57c6ba3594584c. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/QZTVM2464384.
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 0x8f0646f6b9ae7957e57a393abb67a9f7225c68e3fcec90b53697b703e46a5bb1. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/QZK6H2431689.