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 0x3ad6948a02813abf1d453c97a1f92ac5b3025b9785432315213bb5db251d045f. Chain 2 (Bitcoin): anchored in block 953888 (2026-06-16T04:55:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0d9ed766-1c46-4a06-b9b6-a8f34d603cfc.json and https://artists.proofprofile.net/proofs/artist/0d9ed766-1c46-4a06-b9b6-a8f34d603cfc.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 0xa086db3ec767dbfa0da52758b8d494eca5ecb3e495b7c42a17e5000716a76c81. 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/DKJG51000101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63006566c4ce29c7d1c0c30732860929d72f580b67ba6e798b1550ff0fd1a21f. 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/DKJG51000102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb37de1fd6ce0f6c7b3c7ad491d3a164e9272f8e05a83a3e5be466b785de3fcb1. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/DKJG51000103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd395a87a75b330e9a99c743d25b8a4862a88cfa20b9aa475f3fd0505911424df. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/DKJG51000104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f6280c78f86564d640c91bc1a9ac6ada46eb2640c8ba0d7440b4b451a9f79b6. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/DKJG51000105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b5e97022b72effa17851f76d892e8316f70fd1d09d5aa18b809c82cb1fed0a9. 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/DKJG51000106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ecf458138173ff2fea3c79301b95a840cc01580af31e447eb86aadaf315f89d. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/DKJG51000109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fd10cfe92ce11f98863df4132cc7e5c81152e5d26ae4209a78cdccc10184c28. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/DKJG51000112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f19b5af9e03df3c03ff863f11f5e600d2cda14f39ba741622e99eb4d04d5ce5. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/DKJG50804001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35ed541ce32601e3fe7ec18d3d2af7ab9118978e6b5371d9846abc695f604272. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DKJG50804003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff7ef61ff35de30ed4ebeb01574cd1e21055b8a09f3749ba0d12667dd9e22313. 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/DKJG51000203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c2cec5d210f3738489b80e3c33e6441ee90563c69a0584f1e7e4ec2796ce197. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DKJG51000206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ebd98708ccf7c6323f99dbea05173bd8e6813ce116a6be11b1cc37d5ccb2c9f. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QM7282008304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x414bd515a79bf665e0f99d768b4d2824520d436181c74049e9fb6b6b84d8dd71. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QM7282008313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf4b1d27a0b9b64a207afd81d5fe2f5492ab11240a73a5a5af1cc28e27bf3291. 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/QM7282008314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1225fcb0dbbcaffcb8a9142566e7e4c2208af66c2bce5ffe9e3211876229266. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/DKJG50800101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb51bd40b77d24cfca4b6c984f4c4996d3daf66d8a01d793b8c68be9491e50dab. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QM7282008185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e3cf5b7d707789a4ecb63d193fda331dca19a20e9b99785d3c96949651de2d1. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QM7282008190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f70c02073fedcd32a788dd9b19c9450be4baca6ddfa3224b3d9f5090a5da9a1. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/QM7282008198.