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 0x790876273f0167865ff65a82bbe2605cce564e86493ca3386a0e671cbe42a77a. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9b99b69f-572c-4a54-a8bf-578ea34bfd39.json and https://artists.proofprofile.net/proofs/artist/9b99b69f-572c-4a54-a8bf-578ea34bfd39.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 0xc93c1430d26a3a811f70428fa5a92384f565002c8beeb0242d8b150304c57899. 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/QM42K2030175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5aa24a2aeec72df621f4d42453ac5ea2b624794bda462b4d1d74092f87f833b3. 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/QM42K1898603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdbca73c5a44fac69534a038916401c02df25e4964d3a553c8b25fa879b32c9f. 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/QM42K1702762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc76878dde67752726d10c784d23bceb0df1c99e31ff862e4c9fbe607959a8bb2. 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/QM42K1702763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea6ed8ee6a6467a83346067797df4674f4e2664219e9e610f2271968550869f5. Chain 2 (Bitcoin): anchored in block 957210 (2026-07-08T18:28:05Z), 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/QM42K1702764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe01b99260aa64bae44a35ca8d7c6de19e6637036347048f42c01c193f753ab63. 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/QM42K1613809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff4c6b4993ea27985454b640118125f1d5b2d1f6d4924a83abf6bbdd54977264. 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/QM42K1613812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf90c5e24ae55291dffa2820d207aa8a2df42e8942a59db71e6399886bd9fbef4. 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/QM42K1613811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6025daff454d86e30cdd2557cb855f380baf685f87474c6f859ed901fe2ef2e. 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/QM42K1613805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa204ebb8e1b765c0d34faaaa3e93e1538321e17576ab3c2fad62b715248b3ace. 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/USDY41551585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc888d563e96ed0ed242fe4afb9aa7dbea4e5c231cb02c0228b09966a22cc0ff5. 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/USDY41551591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x330947097d7471d11ae2b42180e30fdeba4836db99743fe55a83084ff7d2aef3. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QM42K1801854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e7b9019cc97347178054ec744620bef490eebd43bf00343d72ce3582df8598e. 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/QM42K1862735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4694d2a5bc756321613fb289cc7c4072f3c5705492a9c0c0e8b2d834e6efea85. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QM42K1822579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49711aca88d33b0c4632ba403287c1c5925555e64c9b97a551e1d48041642822. 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/QM42K1879095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6128670ec190576e9585c00698fc55cfc0add7b4fb5844698e92d130be3876cf. 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/QM42K1613798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21070a72e0716f8ad102524723ca5472fbaba8ed2cfd5c50f1327e916d009594. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QM42K1706886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x106f55dd0e3557a3e3d321d5cc3d7a9b39bc3860ac74704b8adb5f0bf2548479. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QM42K1613788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51f6ab1b8a1a837b179b8e3f4042c0c772cdc197b312bbc8847144ede8cabb05. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QM42K1813288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd537b016fc27082db921f0a61da617f3c21117dd859ff8567012f9e93c0ce8b9. 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/USHM21719801.