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 0xdf47bb6b11915f7dba537124851bfc513b9d82df34b51c32d677fa343cd25bd8. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6e9b2bab-8713-41ad-9a90-ae91ac62640e.json and https://artists.proofprofile.net/proofs/artist/6e9b2bab-8713-41ad-9a90-ae91ac62640e.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 0x83cc96216e0cc7c33e0914f43e3199fc1c76b28d25e7ef29727b56980693f4f3. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/QZNJV2140736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe5aefa46e8a48da2e4cd25167107a05481111ad21ba1407b9d80300f7c807f0. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/QZNJZ2165437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c390f74e3969eae050ed2106abd54402bea4b65b2c4e791e69484ff9b02e9dd. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZTPX2275093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ea16c4f58d79b0c3696382555afe4470b5c27c2f2e3f220c78f9c626d96294d. Chain 2 (Bitcoin): anchored in block 958706 (2026-07-19T08:50:34Z), 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/QZW9L2293074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb111b0159256d131184f5d17fc86b1131f8dab1ba9ddcd0ba523654fb3c2fd1c. 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/QZGLM2304906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bb7543b3c4c3d60f76d5ea59f77dff4507d7aaf09e0066b3bffbdde800cc4a6. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZGLS2340651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda3ca288276a5b79354e3438c399d571e474fb020b02bf3e8e5f207696c43dfc. 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/QZNJV2314631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb90c2be770ef47a7928b2de2cb59ba58d8e3a565475b6e6ee8defa9be24c7ebe. Chain 2 (Bitcoin): anchored in block 959026 (2026-07-21T15:38:13Z), 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/BKTRR2300046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dc1d492f3f85bcfd296b213ddd14d4890026d052aab91ffbce99b886981682a. Chain 2 (Bitcoin): anchored in block 958126 (2026-07-15T08:17:14Z), 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/QZNJX2336450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0396e57c0a2b6d5f2bb45d23a4e4ecf6001bc5fed5362f9f74bf9496fa8ac668. Chain 2 (Bitcoin): anchored in block 958126 (2026-07-15T08:17:14Z), 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/QZNJY2343297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f935f223c1b8bd50f1e4b6b250fa5e593eba5210e75d0168d2f9b935ec21e00. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/BKTRR2300095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58da840d78987552d73f5c7a1386ecef53c0ff7e0b55b3dca37e873273bb643b. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/QZ5AB2430138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28e53acef592123166acafa820bb5cb1075e7a0775b9688a764fe0938d337c57. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/GBRKQ2570200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa70d4abd6668f8799ea3f9878288d2e8cede8820a62cc0e10b4dbbcbe1772a1. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/GBRKQ2570205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x135796070ce08717b6d31bc2a1eab8d205b9718bba9283f5fe71710d58953d83. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZNWW2467126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a0df59b78bd7a02c6f43739266deadd0fa03c1a1f9248058adca0fbcd03126c. 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/BKTRR2300020.