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 0xd6326233dec4cf011ae07bc9a536249157d76f5588363e179c32547d0ae035d3. Chain 2 (Bitcoin): anchored in block 954025 (2026-06-17T00:32:47Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/380b30bd-a5a6-4cfd-b5ae-afccccd1a04e.json and https://artists.proofprofile.net/proofs/artist/380b30bd-a5a6-4cfd-b5ae-afccccd1a04e.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 0xbe1ac1f0084308082d0f543afcc53a380b1c98217c802c5ae532b18d1d64fc51. 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/USHM21128677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd65de01dd1fafa4d98d97c96674f216200210b7a2289a056c6de9baf3454cd0. 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/USL4R0729496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc8c691349a7c869ddc3da889e8bed0c788b12e2bc01a9db0ce0fed8aa8d59ce. 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/USL4R0729497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd432e5086b1c9011c933fc41e0ebf407b096c3cce25441aa8cfb22470c7be55f. 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/USL4R0729498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf1eb32a9b419aa4a83c80d6dd7c0bf6740e4adafd8e60495809372aa1ffc4fe. 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/USL4R0729499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ec7ef5b0236bc46a486a0b41a9c61ce44b1a02e730755f4ca7e41a255a99d93. 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/USL4R0729500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d1b5ee4600db023fc005bf35945b1ecf42c259c06ffc299530c52dc7089f48e. 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/USL4R0729502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedf501b2924cdda15c69b0f9b19e78ba3f69e9935a7384beaa00f7defab05b7b. 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/USL4R0729503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0134caf1d9c51b17ad7e263cc916150b8ae10edfa49300e5067bf500251a6e83. 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/USL4R0729504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89e9e780a3b13274940f18ec8feafbeb1c346596cfed59432807cfd3c54d9086. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/USL4R0729505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa82dd32393973fa593d08ef52c44c133abd6d84162fcf65c0c12ee4d5bf9a52f. 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/USL4R0729506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7b012cb0805ef63236a626f63c3ad7e65fd3ac7355dbace5bb9e0aeff10dd9d. 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/USL4R0729508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c6013c6f2bfc89b51c6f756ab920ffa384b10caa9d33fdcd7c9d2dbf0b1a32a. 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/USL4R0729509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ead136f5739d30271b408ce9007ecf6d5f7437c4bae302d3d79ffca848631dd. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/USL4R0729510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8764ba031ba64b2265de6de693b4160f3ffbed0fd4a9a9179988a1bdab54c751. 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/USL4R0729511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee9ba2d231909128b61a1750c05e346f8725b8cc8b16f0544635c165f5e362d1. 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/USL4R0729512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec1d65ddcb946748d4e72d3219f998a9cd9ac43ebc01d3d83b83989d435c402b. 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/USL4R0729513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9186f0f3600e1cb43bda30b12411086e5d8ddf6f47b92ae6a16f746b334acec1. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/USL4R0729514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2744f98d7990ca4400fc0ff2f7f95a5d8a67f2e9132f192725c971ec6f992f7b. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/USL4R0729515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bbf77000fb63470068dcca382e6170e43e082d2c9af30b1d56f1e6ded483a95. 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/USL4R0729516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb49aac2954fd79a1965b73612b00fa384b0ae1786ee017fdae8642e2b4fecfbf. 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/USL4R0729517.