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 0x448ea5f64e64b00faa40fbae3ac026a53017a010db9eff589ac5a1ac4d19bcb5. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f0c1e661-69c8-40f2-aa66-8ff35649ca74.json and https://artists.proofprofile.net/proofs/artist/f0c1e661-69c8-40f2-aa66-8ff35649ca74.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 0x73d729ea10779240f8ccac3fd02f68d3dba4cb27e3636a4ecdd71002f6200343. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/ES71G2333612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a624cce9e37d43c9a81489b129e5ab925c2f0717230b83058fe53fae71423c9. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/ES71G2333613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8cd8a4a35a047e151a2f489806a807adf9ccfb507518606afe0f3b299c10697. 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/ES71G2333617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab64acc2ce2445f0552f2f8d024638341a5bb7537e238a2a95ea2ec30cfc8dae. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/ES71G2333619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8d0aaa5235353f8413e2fb4a18f88f6ab837c744ecd9212101f44e2a6a94e2d. 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/ES71G2333620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bb14df96f7c5dea74f0ca8b6af3c614e9dca51b992a7f73239159ca69620812. 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/ES71G2333621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2dc2af815489dca1a51bc1e71a1b531faf2900de78dc6ba7ca3ec30139339a3. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/ES71G2333622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bb2420bf0c183374b67c49eeb864a6b46a41b25664ec79f25acc2b31fc9c890. 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/ES71G2333624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c77b53ee90ac91a1740f2fc3305e5deb31ceec2f4714dca5f6617e1d1e48181. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/ES71G2333625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3af9f4fc36a7fba2226fca526ae7c20e7fdf3407a2de6dfa3949db13605af955. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/ES71G2333626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3e9e2365a3634bbe91c0636142de787720bf7f87fd8a61164fbc80792a28ce6. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/ES71G2333628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x070259cdd89b1c6f011747aecf2f2204ce365943f5815cd38aa039a2077442c8. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/ES71G2333629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x814972908f4e303afb4d9ec9108d12e6368f282ed99e95f3904557277ca50c52. 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/ES71G2333630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc229c833a46499788bf7af932981eb19014e1d4411e760655baf140999eb0f91. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/ES71G2333631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6fdbd940652bf1f146fd19345d8b5ab827f77d5b6ddff2087cc2d185a550c19. 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/ES71G2338164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64c939eab4e536d77ca049422f35b0b6aa247e4aab3b300d6763d05789da0c06. 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/ES71G2409790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x262eeae643f9267e68814a3353c1f8235ebb2d4e9568037aaf6129b32ddc7b4c. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/ES71G2409795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4de7378fc4ed29d17285f85d8180a28554de333bd1c1aa02d5a75da959098a00. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/ES71G2409798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2af8c4297a4a225695276f1e37a6f22ec6a9397c6e090d18c98c6a8001364411. 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/ES71G2409799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d496efcf9aa273821968e7fc59396a170393fb3bf64bcc935130f0bb01e8e20. 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/ES71G2409801.