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 0xdf93a6d90b48ee5312df9be3817f4f629c99a5130f9823c65f2d2cd59fd7f376. 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/ee6fcc9e-3519-4d1e-b8e2-3620af724849.json and https://artists.proofprofile.net/proofs/artist/ee6fcc9e-3519-4d1e-b8e2-3620af724849.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 0x5f17c825bab5664640ce01e60800a6b2cc8229ae5fef6e7c47bac056a15434cd. 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/QZZ7N2506134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2728e442c95b3d37d6854e02b3c34e75c8e04b2d9dc594f2a1b4741ddfed333f. 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/QZWDD2342189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb7f2b0e13d6ac1a5054665f5c4e835df5c609b947e960841f3225ef42f66849. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZWDD2342044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65e4b436ea374bee0ebfb9896f681ebdf13dbf23bf4a8b4302c25612e5d1792b. 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/QMFME2293732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33006d32f812269df2a9ec0c6448ab3f6716185ad9257ce3f52cc72f3b813fdd. 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/QZTRX2224690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83885d4e0be3aadf67debd6d58179680cec40a46e0c5f47447b5624ba13a5e17. 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/QZTRX2224691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0978ed017b276a286eb116d74473624dec05acb0c64a68362553f0d74881f425. 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/QZTRX2224692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4126c59a1561773278a1ddd3733208e24c5089f0845f6656f822c667de88d7b2. 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/QZTRX2224693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x016a6abb68ba4808a5214d53a01fa8371c449060fae45d2ed3ae88af094e2ce9. 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/QZTRX2224694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6458a54977554bb72f84b43aab25947e7c11a6a725a5b3120d0b082192a3f93. 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/QZTRX2224695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81f9d55a5d8b6fda0e00106d86ad10b56ae380f8ab9f74afb6d8295360eff1f4. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QZTRX2224696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27d3139f42b61413fd0277ba794321c22a76ca894630b8cc6359a56419e9706a. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/QZTRX2224697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b5e1906006274e3e631088338249448e94779a947ef85eae58fdb5b71c2647d. 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/QZTRX2224698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefa3c67602c700c7af6fdb22b36ff15c25836c5d8612effcdc988037b6e54251. 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/QZTRX2224699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73148b0286f49965e011d85d676d9f2bee346253f8e9bf8094b74183c37a34f5. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/QZTRX2224701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x156dc37e22b83dbb1c6a7b6e63deddfbd5dbe699fc5cbfca0dd7fce707c9ac4c. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZTRX2224702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcd096bf3e24d9e9a9b233783a70e884db400baf7b5c2c470f6cb4d71c3b47b5. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZTRX2224704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec22db74d788195b729f1a4f986944aa0abfef914c75cbdef49a10653ba73bb3. 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/QZTRX2224705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89e06b76339604a2e0f497feafd63a9171ae6174bb8e5497c6a172e7312735fc. 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/QZTRX2224706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a683fe77d47b4cee4d3c450a6ff227997b2fe02c9bdb0b5d3dacdc4dd93fc93. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/ES71G2303013.