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 0x29c9022d6e132ddee380d7dd8de9bd9c7623eb990a51389146158047804352ce. 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/0e76ebf5-0f3d-4d71-a0e0-a25bbb26e13f.json and https://artists.proofprofile.net/proofs/artist/0e76ebf5-0f3d-4d71-a0e0-a25bbb26e13f.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 0x26527629121e603879c8aeeb0b55549949989b0640f7e8cbd51ad8b2e590784e. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/TCAJY2512332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1b7d525ebce05fa77fb60a05b90c669bd69aeba09bea1b66d09a9e5179d4b16. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/QT65W2575582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8431b01f40647d76074822717819fbc55728eec5ac65c3bd78a373d22d76a84a. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QT65W2590902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcefac549313e0e7f01284da0ac8b08296b6eb042a1ce8e0eb9828223a6d659d7. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QT65W2577576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccc585066175466c8ad9b66f2346104c4e1db6d4ac105d158abec07457433b18. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QT65X2543415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e2a643aab386fee2cbf1861aa49201075ef52cff80626d929625c3374060a63. Chain 2 (Bitcoin): anchored in block 958920 (2026-07-20T18:14:22Z), 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/QT65W2589542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b7798e2a7ac4c8c4734eb68e4b83e34af84cc64e070143ca2e95dc439ed5ffa. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QT65W2593066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d063ed9bd8cf8891b823cc4e50162f3b8233e675c48331f17605ac5961b5ea3. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/QT65Y2578051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x280097f74a23c2d1943784d5ef4f1f59119275367e60fc83e0fbcc52cc2599d7. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/QT65Y2577303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75f4bcd153984806f69900da91ba124a3ad975d05a45a739a0528d223d2e415a. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QT65Y2588261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddd05b90aea10c68be53c7c08b757fec25f0468c6942a91d7c4affa9099ad5d2. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QT65Z2506677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddd99b84633b11d950cfd4bf285ac3fb56bc5fb583d76cf2b79237ec55dc3f18. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QT65Y2578013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64b89d1ed1368003e0a25d3a06a0c345d498e3ba0028c4330e1d5e6d9b21a99e. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QT6622514819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x640da2b735f242c7e745b601bc06e8ad4b24915fcae469973e6943cd6e06660c. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QT6622516282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5333e2764b611c8906bebdca4d5ed62b7599581902b8200b06ffcf5246ef3037. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QT65Y2578095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33e9e2f1e80442d8677bac5a3a73473d5f60745503591deb2ad122961a20e68c. 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/QT65Z2569971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6565f144c508b15885fe19ade24510dd2c7ee4041ccdef641b85ba31af56a81d. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QT6622519510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc4818fde7e6f4977b8d8c893c381cbedba89109d2b409f044e37c37c0ccc3a5. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QT6622557619.