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 0xe9390807b85d69b96ed27bf9aebac664c7cb0950ac0b2a2b8397c709f59b848c. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ce8428cb-3e69-4b68-997a-ee70b869e278.json and https://artists.proofprofile.net/proofs/artist/ce8428cb-3e69-4b68-997a-ee70b869e278.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 0xa6a2e08159749a819762f4d6383b29752ae97f898bc8859783f0d8975529c231. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/GBKQU2367313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x509814f1a6493c8fb655777b1fa3bfe843477629e35cfe4133e02cfbf8b155b4. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GBKQU2367314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x810318d11bfd46af748dd2e873319ca3e60406e3d410d0f3a0c853e74c4b566d. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/GBTDG1302544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x964374c2b6a4016924b0a386731ccb1911e0c2d540b40b7b42012258e8d1ad91. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZUCN2200034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1478c5cfce242d1a4af35f6b87171f845ab3d85dd4fbe1969095f41093a15a2. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/CA5KR2222081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x548f47e4474397f79be00c3a32df5ef9c9b89f0db9db34fdbed38aebf86a1f91. Chain 2 (Bitcoin): anchored in block 960306 (2026-07-30T20:23:53Z), 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/NLZ542300912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7b0f1213b44f9b047aab85947294d581ba513b67025c65fee18465099c6435a. 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/USLQ22180821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d3fe43f849d26b2e49709cdc98450508e174f772652bed41fab426dcb8aac9d. 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/USLQ22180822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x484b8f5a46b48fc253c47a9ebe7c4a544ff3a38148092cd247c05eaf0e5c4c97. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZ5FN2564825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0b55b22809d3cda5e86686900e377a31ad480cbcf6078417a4d279f34c9cf94. 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/US83Z2319456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd66063a5d1af8301fc19057b30ab674b40953a0efb2fbff6f8a6d76776517c23. 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/US83Z2319455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3534a23e87aafd0679a3326359c97b297158cfb777bf65e7d05022da1782708b. 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/US83Z2311326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x062cb6af07951cd2c549b40b52028c6bef4a3a1576081f534d1f220a88d4534d. 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/US83Z2228510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x000f3b51b1acc6a09ea71f599fecd5bb0e6bfd07898a4d1976bff58dd182b1ca. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/US83Z2223684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ec144f523d08328ed770573a5233d978ab3140104465fe7e57506dc47757305. 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/US83Z2212829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe826c5cb58053b52e7d2c78a730970d509b4e5d4a3adee0be029e3d4e74c19b7. 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/US83Z2212831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5e76b6b0cc372748f84103d5e121e41dffab01dd391152d5b6750acb4ce27d9. 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/US83Z2125095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8880d08f9a20a6c96668d2d699c892af96202c2f14bb97d88e0d405698ee7eb9. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/US83Z2037197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85654b2390945d87e81e1e3819a1f3bb288aa5e0e78fdf8533e3ff0ad22f1942. 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/GBKQU1994041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6b6d51b4bb24c07ade0fa6e6f4b6d918d2eaac442f65b666cc4d2745e369899. 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/QZ5FN2564807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x534bce38581eba44e250ad21f0f6bfa705e70073a3a9ef89564bdcd496e1f7fb. 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/GBKQU2013661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6d470ad86c1b8afd761b079d0e1df4f89ae95e31e483c7ec054f529762061a4. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/GBKQU2013667.