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 0xf51e2d3b4e56afee54da3aeb306db67a0318bd38654840d0e3739e47a953767f. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bec6a5c6-32a0-4021-b172-fd37a9ea1da0.json and https://artists.proofprofile.net/proofs/artist/bec6a5c6-32a0-4021-b172-fd37a9ea1da0.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 0x2069a06abacb150ef3b1b9831cd253fca205b425cb80cf9ecdd4dcf66e4fd9ca. 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/QZQSQ2100013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e478504ab2ee3e7237d1397a125d1c8e925ece5f05e885dd95e86e8cc39b770. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/QZQSQ2100018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c31e41aee923e2db30757a7cc610aa20602e7c0213367bd988573758df96c00. 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/QZQSQ2100014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28e2f165454864fba1c5b7ffee246a3251e170040246567c538bdc4c8d00d3a7. 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/QZQSQ2100012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c0bc9a0c294d3e863873489de13618cc14caa78bcac843f46417dda6f334cd8. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZQSQ2100011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa55c8d83c15ae57cce5bcea71855f9d4a865135635d437c966b8ac606e06124c. 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/QZQSQ2100019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a60167d048785484005c2129ebc54ea5092c3dbd16b9ca8ab3d6bc25937f6af. 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/QZQSQ2100016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87aa95fd5de9a80891684e1d76ce07423703694416b23cefe91cd758afa69b79. 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/QZQSQ2100020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c7249a1ac133aa27de44b65b0ab51d71937b81429d973e4d9677bcd0cafd60c. 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/QZQSQ2100015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46d4c0f2a0328bca85e025ea5214ad66265a54f36bd10604c01d609cb1bc8974. 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/QZQSQ2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd146c2b3cefbf624c8eec29e7548521e7fa91446af31bb6aecf54baa79b96166. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QZQSQ2100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e2b8e7eabd3cc64964f5d83547891fca1091df1a4483ffa8ca16a6d2d5e2a51. 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/QZQSQ2100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda6ee6e3cc69488388f93e0bbbaeac822e4c4f0d3400eab0f6b45d98e0c2edbe. 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/QZQSQ2100005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1d24a911ec004ce518d4caa4bbbc7f8ba79eab33e94deb9830880573d4b138c. 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/QZQSQ2100007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa29e516c70b579b6f19c8985a47bdda82fc417c9c05a8e5d4b67961fddd69762. 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/QZQSQ2100009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c0bc9a0c294d3e863873489de13618cc14caa78bcac843f46417dda6f334cd8. 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/QZQSQ2100011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a60167d048785484005c2129ebc54ea5092c3dbd16b9ca8ab3d6bc25937f6af. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/QZQSQ2100016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c7249a1ac133aa27de44b65b0ab51d71937b81429d973e4d9677bcd0cafd60c. 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/QZQSQ2100015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda6ee6e3cc69488388f93e0bbbaeac822e4c4f0d3400eab0f6b45d98e0c2edbe. 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/QZQSQ2100005.