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 0x2bfb65124e3344acfdf34ec0c71fb94e7745b4d7594e3037535e58ac194c88ad. Chain 2 (Bitcoin): anchored in block 953667 (2026-06-14T17:49:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/580fb565-bd3b-4654-bcc6-8f83ee80fc62.json and https://artists.proofprofile.net/proofs/artist/580fb565-bd3b-4654-bcc6-8f83ee80fc62.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 0x29adf304578b69a281efde3a6514e1cf48fdb8163071d5a5e495978d08ee83f1. 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/TCABR1303727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b6f10a7f353b27bef7d602ecf47c8257d62b8f858b7b5519be680a64cdbe7de. 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/TCABR1303730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x045c7fefced2c45ffeaafc56121ba9fcf47a0498555104c1d57a771507585507. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/TCABR1303733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf32ff3fd7e889baf75293ec292de0c3ce833a7e948e1dfc6e6446c03903960d3. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/TCABR1303739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76ce6b966a5db79024064932615d29a5053ea176c2445466a005fc8db36c6354. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/TCABR1303745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x903831312342b47dbb993b8f16192bbb22e2dcc5b1b4cbce4735106b1286e947. 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/TCABR1303747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2eafec09014593bd7bd1639cdf7b83ecb869c3a4cd7f143729849a7d2cfdca44. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/TCABR1303750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ac21bfd3d44b7aa4cdc41d699b54b2ef35b8901e3a63b99973dc7204824297d. 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/TCABR1303754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77e936fc9e9811b80297b4cf809b6b6e9fd9056958bf46bfc2531c782caab958. Chain 2 (Bitcoin): anchored in block 960157 (2026-07-29T22:12:10Z), 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/TCABR1303763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x724c92c5f0c7580ebcee619d60f88130be78bc530ddba17b78c1b2c917960519. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/TCABR1303767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x123e82cd2da9e3615cfe556be3da5b1804ea1f989440fe53bad976643d611c11. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/TCABR1303784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ebe1f5b9b9c98105d1daa53c870d949abea0d611c5d35f1a07f4b3062a197ae. 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/TCABR1303788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ca38f7609a7dc46baab3558e0313f1528136fa3f18d4e62d8096f2bcb1b0838. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/TCABR1303790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8103c573f26004608eac24b80bc94b24ad92761888a3e24716157d63f32bac40. 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/TCABR1303794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75f563b86ad2197cda81ec768bd0084e926451b3d77024f5295e5411ec26c1c2. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/TCABR1303800.