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 0x816097ded07c48d39fa61a0f6aa5c8d4711709fc4309b9fac206395913c3cd0d. Chain 2 (Bitcoin): anchored in block 953896 (2026-06-16T06:05:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/10eb73a9-fbb9-4605-9f26-cf44284710de.json and https://artists.proofprofile.net/proofs/artist/10eb73a9-fbb9-4605-9f26-cf44284710de.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 0x3bdea8bc5512f031040c3ed834f56c0e06a5d77549f0bd2dfa1a72791e4513f9. 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/FRZ751101026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a7f83a8f97012e2c0f0f617797f151d1617cccd82017815424c2cc939e15ed4. 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/FRZ751101030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd30fab503497a4488ef5984447cf536fa76c0238f3052ebf1ca54817cb82e430. 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/NLCK41073356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20ae7bc38e171853378b09445f1aad43fbc35d74dbe585d3f68cbe01ef41ef96. 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/GBKQU2077235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0fa90b3a1423eb944ee825ea444ff5ea0d21e9df9cdb8ca63540d6153347410. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/GBKQU2077236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4fb3ec2bea2be284f51e3d1ec2c25a70c1f89261eb18eb2e1a59bdcabacd1b6. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/FRZ751101075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7c0b48d0fcc4da59805e65c60d0a68b296a34893b468e2bba2de6eed5fc9dae. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/NLCK42211533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e05c0756cdf81e515f9909d9bb9f9fb2bea2c5e1a7a495e9d5c4d86061c4f20. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/QZNWU2259684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58292895bceadb778e834df221eb34262195f7189d354693651154a1d876cd5f. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZNWU2259685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x713a06d4ec76e0c63a7fae0120d2e7710ba07ca40f001c5dd65aec02f61ac89d. 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/QZNWU2259686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7990c2645083f61ffbfb75dc34c9de87022b8113924781afd3a6be961d4eb74a. 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/QZNWU2259687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c58353c758ad415d38e078ed4cf4de06a2284f95e98560bcdc5d010f1dcb9ba. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZNWU2259688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac36ac3e2724387b70d546507a15dccf849baf85b7c05d14edc0a2468ef0990d. 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/GBLV62002445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eaefbced0fe3b05fd19782653daace3ea9e42e87d088efe22f8321c8138e3c3. 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/GBLV62002453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbea32d9687c861f194f3fb742030ed6dca6c1fbf7dfef0486bd45f7ded5c1dd0. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/QZS642223073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9da13f6c0eb9783100cee3fe842323af37bfb7908c259b28a20b71237bce1acf. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZMHL2277007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0191c08a45c7cb791e8365df57e76eebee2da17cd9c2fde9f0bf748fb6c00d1. 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/GBKQU2416657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa40838837d0eb63d04061e95c6955f8e74c4d7524b597ff715c7914d1a7698e. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/GBKQU2416669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd6bddc958d245d2cca1b600f0527da6c5f00cd2cba7de07859ca8e4a5eaaf45. 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/GBLV62323358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bf7851e3fa276cb19343674089158f9f847f2b9dc949dfeedd494a489885090. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZ5FN2037210.