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 0xa79d73be6333f949636a683a79e42305fb5cafd8ce68e3babecfad4b16a1ac6d. 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/1517ff35-b283-4c0a-93dc-cf9fde8f3bd4.json and https://artists.proofprofile.net/proofs/artist/1517ff35-b283-4c0a-93dc-cf9fde8f3bd4.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 0x0087a7ef5c62f5f28c5228c81f39fa300e22d6c08c6c267fbb4cca3edf2264ff. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/ITDF62177012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc1b1050e17afa3a3ba257da61129bc43880982eceaf0146f2a7f1a64de05fb2. 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/ITUEK2200029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2001c4ffc30ce5e360d28ab3dfe10eb91324d762ec5ec879d07f17483f09e831. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/ITUEK2200031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeec29c794b7cb58ad10d055f487d84e0d1b349ff186745e7bd395ee7aa0e6aa5. 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/ITUEK2200030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdabc4e549f39f71e65fbfa7997b2446afe7e7877ed7144b8bf7c899d3e37492e. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/ITUEK2200032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6725bf9af96b368fdde3a40a7cad45330dcbfc863a48683e15366a78b04087b. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/ITUEK2200033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc497b005cf4de208ffbbaf39c81c94c6570c0443d7ba495a765d8c2acf4acd2c. 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/ITUEK2200034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa78aa76ed2dcba956b98e08c76cde9723e25f5440c70476beccdcc486db11bc. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/ITUEK2200035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0caef2e5fed3a74c51d05d0c4e290eefe5e75237b3d882abc5ebd68f46ffad00. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/ITUEK2200036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fd7c3620a1242b243c9a4b00c794e89217f56e2a9580a233a909280c12d16c8. 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/ITUEK2200037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bc74464d707f7837b066a8f6b303ab9291d271dfd4742f126715dfcd16c5eb4. 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/ZZOPM2238545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59e5e78806e0992c94c1369d1cfddac99fc2497209dbda676075f810bebab0a3. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/US39N2202042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd7befd98c579052ad488bdb1d94979964eb2ff14e56c07bd7c56c6bce499fb3. 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/US39N2304775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde1692b2c222e7029970d57389dc60274fba976c6ede97032c54804ee8a00ef5. 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/US38Y2312158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed8a21a61d084df614222621a67bcbd1a3b6d5071fcf23f9add1641caafe99ee. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/US38Y2413745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66d928e260d5bf828c37c04ae192dcb7eb5d055a18155eaac4c747a7d994bd78. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZWFF2420077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34ab1b19722a48b16a322697673c52be5b192213fc1a9b9f12f3a2463435d68b. 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/CAQOI2509047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38fd435195852a41d779d34ca49b39b907f043de797c1f0e1cf22c06cdebff1a. Chain 2 (Bitcoin): anchored in block 957791 (2026-07-13T02:46:19Z), 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/CAQOI2528991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34ff26dff43a963300928193f3eca4bffc545b555571bea96efb664fab330d2d. 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/QZNWX2176523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x475870f6455c0d6c97289e12fdf024ef5b39f84214498bfa47c9d90fe4e217b6. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/TCADZ1875974.