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 0x1713dc4df70c7dbfb0af5c2d38b9348366a0811c83d8090f20cb4cdfbe85cca6. 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/2930aa86-12cc-4f2b-b10f-b1b7ff46c970.json and https://artists.proofprofile.net/proofs/artist/2930aa86-12cc-4f2b-b10f-b1b7ff46c970.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 0xb90e2d5e3ab74e9ed7e91d55f4d3a0055f43ece5f037f2ad9ef3589acb13de7c. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/DENL81700780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb42931ee2412b2edb9007c1be0a44cefebf4ae00a37023995071ef6413dfe71. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/DENL81700782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x109c269276316413c4ac8669313b29616b8437c64ec3c7d74940f780ee23b9a2. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/DENL81700784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6539eed4168bd0b4988a78d73afba76e2a154d9b7a466a80816ee0cd5630916f. 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/QM42K1939184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2189c7a9c9b3c11bb778fb028b8d841daf8f3a4e5c85e945900d1cd7cfd636df. 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/QZH5E2078430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc32dd0227c7c13beba56aed7b33e78fdb52fd75782f3c1fe54d20b5ce855ceb7. 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/QZDA72078471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05d3d724467b6f32f0688d51628b9dc1ed3193d7ffac7f06879d13c1a2b7abd8. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZFP52430533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebabd24420ae49e45badabd1afc8c3ee5feab9984a22bc2212c5b0bd331d24f5. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QM8DG2558296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x669b7667a35af1e6fff6675aabfe02e763af060416ab3b508871c19eb369de59. 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/QZHZD2519866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f504861cd16ad38e664112c36885706890d0d98050f1547a2844b2c5fdff47d. 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/GBSMU2278770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc26dfe598ffc09073a42406dd06ff6ec06b6821708a5442bcbfdac4643774ee9. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/GBSMU2278771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5df8a9ccdd024cea4f622c84a498fb27dd46889e157b7a772830241d8576b23e. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/GBSMU2278772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f14318a733965b18a4210739be77504bd92a921abca976c032005a24aee91d6. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/GBSMU2278773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8510516856e194247523713127fbe05e93a66a77a2d6e618d7c5aae8307e55f. 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/GBSMU2278774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75c660c1a791b9d10208d3c548edb2f7b526b09c86f33841cad1d0328d897a41. 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/GBSMU2278775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3337be93e469dd942d6dbef4ff15d650b39a24884b70aea0d9be9e371fc3d6d1. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/GBSMU2278776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca18900aebfc639882d11229f21d7a664595044717d68218bad4f7db88acb3ca. 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/GBSMU2278777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92dde45884c791872c9e0a69888ac31447f9a61631d6d85dff08e31e8c8d0c6b. 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/GBSMU2278778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x731d29e16b9cd39fc50772fab3c0e74c8abb20bd437ff094d74d69113a4b9c5f. 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/USA2P1922643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe637a6e431b51b8addfddcd01bb67793d499bb9a97de39a1e79fefcc5fdc45d. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DENL81403414.