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 0x05a6bc4ead7def40934cd737d7d0ec1723c9c5a7a65517ea9e3a776ee32acef5. 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/29ae1430-20f4-47c2-8ac2-65395eeb1db6.json and https://artists.proofprofile.net/proofs/artist/29ae1430-20f4-47c2-8ac2-65395eeb1db6.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 0x7ef17dbeb0bbc26460576dfdb09a0dbff705b5b2c6bc6a89b3304f0fb6a8a610. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USANG2218802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6a144e4795a0c61ad17c9843d93614300d3d21ac1f19696c94bc742ba120a88. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/USANG2251194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5af28487263785e3d8f32e31fd2d43821c46d4fdae307ce58bf63cbbcbf49e79. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/USANG2251247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a1f894e50ab66a6ad905662515ca04d8f76b43bd058f65c8665428ae5d64ba4. 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/USANG2283689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a03f57711344f23cf5d55f1a620766a778194a8f257302c465bd5dbab4ede17. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QM3DF2200418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ddfa442774e8b32f021843f42fc3ce5083abc0e885c50edaf9f0a2bc1cf35f6. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T10:57:18Z), 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/QM3DF2208241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e7991adae7807b0a4aa8f18fb9b234d06d4363af7ef5e71e03099d33e24c592. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/QM3DF2282903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bd2b1ba0db669190cb00f2df3c576bb076480e1cc42ed7ab50721ea0d1d6b4f. 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/US3DF2427387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6db985a10d54e9a4ff9c8419ac1b6be2ef5c23f13d1180046d405324eb221f78. 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/US3DF2447063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe87450d632cb685e40beaf4739010d23b5f1c57b57ea87820d11eb5f83ff6acf. 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/USANG2402622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x774d2db8340bc18525a25d328364dacc123086190a289db70c6f9ddcb7b8fb67. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/UKZGC2408460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89e1f82239f07beded41e8f9776b3122194b4775d54d90cde7e069ffe4fee5c8. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/UKZGC2408481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f0272ace1c2e187c400754d42f4b8ac1c824e1c7249f384ff90dbedaa98283c. 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/USANG2477393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8326b3bab5cde77735123e13384ffe77cfd6e0d49866f519854d6c0b15c43706. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/UKZGC2500879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0b67ec71c4b2d84b256ae4138818d3b876f50860e1dc0e6fe968354aab6416c. 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/UKZGC2411289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd55281b7d74cf0f5a902a56509abaebad82d0270986d69defbe83745f9ff15b7. 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/UKZGC2408846.