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 0x23ccecb83178e3154407c3c452ac2a8b92ecac1e8b522392779e85f25d180ec3. 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/1dfdda25-3cbb-4b1c-bd7b-01f37c404533.json and https://artists.proofprofile.net/proofs/artist/1dfdda25-3cbb-4b1c-bd7b-01f37c404533.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 0xae9da02937b97957286c8d0eb631b9df0830829ef46b90ee725b416d03f30dd1. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T21:02:50Z), 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/GBMA22470145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8b64f8af6d84e4fee5d2137828cb5db5ff29face8847a199fb6e8fc2bced67b. 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/UKXN22435184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dbb02c3843cad82581b963f419cad891e87ad98c65c33df2ebf380e3e331998. 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/GX3Q92429454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb715ceb4cf2bc24c67a36329b49b8adef2bd896d8b1c11113fa3923568e094cf. 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/GBLFP2437450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17ce1104d1b3a14364d9662f811270bc36dcced8e3213d2405ba5911a1e16816. 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/GBMA22304499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe699fb6fb5dabbe86ee013027852ad264fd92e4da341e69bd9cdb2455ddd8173. 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/UKXN22337716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2d70ad4515cac76d2460ef39b30667bb867697b1b5207173426185f223cd2de. 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/FRX452353868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04db235c745292427693fc32a2e075947626271b90b0bca65a05812baf0f740b. 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/NL1ZN2201952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd0bccdd6df3c40392542f27865c88b2c475afaf095a1ca6c41c67c050b31c0b. 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/FRS182120776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f8791de1c627369566ef235e9f5f9e71d7d0f9d9650d15646a22903892f50dd. 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/FRS182120775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc90ee213cf28b2a0512e11f17befe54c7a16023b3478d5c67e92202cfb6bc23b. 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/FRX872161898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde59d699437f367042d3d540e58297964346b2933d493c17cafd18460812db29. 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/GBDLM2100223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2537f92edc40747f045a50d48a26da10b9715b94db1636db061236557f2f9075. 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/FR59R2198493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67d2c6cdadb131458a424615fe711102b4da3e9b31aae4e10ad935be4f1e9168. 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/TCAFL2169268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57501ba5a21558a70a54e3da4d42badda5e6ab850480de7aa49ef6e6c899b2c4. 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/FRX282067672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7c2d90c1c3f6e664914ab171d6d2e52569692eea7306d8237955c3de640df4b. 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/TCAFA2052819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f8cc825f4324e030ddfcc721cca11f12f28add5b5bd90f57405f7cbd9a48ec0. 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/FRX202086611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5bb3a258b8b7a6e91681afe8ba839e5d97c98f98262d9020d098ac56fa599af. 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/FRX281940073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d80110cee626c029c1e6d1c9115a35d48270a505d0a6f1fd7ec306e50fb1ff5. 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/FR59R1991690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf85221aaa31398851db2e7b52361ed86d382baa974f1621a9057f3f9dca873ad. 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/FR10S1967207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58bf54dd5d53d0d4a8a825a6799a368b3082c652e2cc3caac9fddd479d83b65c. 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/GBSMU5629515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb157ee0a78f60289782c791242c324d6ee75e40c96de56e145770c33ea32d210. 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/GBDLM1700083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed87b0b13c73169a6be0e6ce01dbc90145a5fc4c62ab3f5b0eeaa90458cbc633. 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/FRX201769397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x610c4f2c579afed71a889b0a6e78d0999c1c54706e2de951cd4f152d1026cb89. 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/GBSMU3100501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f09a9c755fe6f405db2a6e608b72d7a0c2ff209c87807e54b6fd0bc768e5ac1. 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/GBSMU2174859.