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 0xf53216dc4d84eccbce63b71ac9ea273c6fab0412bf064954c8f194659f56afc9. Chain 2 (Bitcoin): anchored in block 953660 (2026-06-14T17:20:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/557c2cbd-96a4-4d44-b51e-cd9d82654a3b.json and https://artists.proofprofile.net/proofs/artist/557c2cbd-96a4-4d44-b51e-cd9d82654a3b.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 0x61be4bd4625f3f56d3622e96bd2f553e47c7edda4d395bf0bb32c7f77830b54f. 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/ITOOJ1200121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1276918dcce6080145528adcaf9aaa0c723c944426ea04f6150330d1320030b3. 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/ITOOJ1200122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8939fba86bdbab0bad95b852e73a0b2e0b3f95a72c3b40444d6b1a63e29f7e5c. 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/ITOOJ1200123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x701312a8a3a4fa55a305c3e9d8e84e27786b22f4fe010da2a3f160153eeda0ed. 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/ITOOJ1200124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed10301bcfc34f287f89ca36a7206af5d975db39723f8b80d4415363d9dccb0d. 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/ITOOJ1200125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a0b1321587ff9e294f1a0150e9e4c5c70dff9906bdbc5748610825edbec188b. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/ITOOJ1200126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78bc9abddef402e71a86116ac854360ec36815b704fca067db08f6e2d172b861. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ITOOJ1200127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05524717e8bbe9ccee9673bd7401ec2d550ab59029c211d2d901fbe28fc9a4ff. 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/ITOOJ1200128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9c757955fd919f31278918d984578142fa0d16c103c4d3f8ab06e3c47689a53. 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/ITOOJ1200129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce4a0f3657bda3819828e1896f7f87ccf4919fc102c4e28a9f60cbdad54c4ec6. 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/ITQ710900016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5b5bc070c921d097062b741c13a2da379e7a77a2dbfd0fdd7d02b97486f583f. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ITQ710900019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf44201ac44593b98fd28ee4d90e8d65ee64b018b70fe828a82987d2035a64c5a. 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/ITQ710900021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed7e04b5bcc2570795422c168be3cad8e73ad02a4c1fa839c0beeca197bb2c15. 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/ITQ710900022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x533647ca278407a1a534e183abad51a33544e9ae64cd9e3b4c3fac3b9a2aaff4. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/ITQ710900025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x885df7670ded12fff071fa4101be5eed04d693f624eda7a1092067fad2576841. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/ITQ710800004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa77382a6fce0a91232ac6fa4aaa4eb30e468ee050c97a60194218163c1f0c4a0. 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/ITQ710800005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f7529b12cc4724ecbbbbcaf4244db1681935db6bbd3b672c7faf062dda3491a. 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/ITQ710800006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45904dff93c29cc67799aee9d4d8fc8a6193f3bbc934b1d2e0dd07ef4427740a. 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/ITQ710800008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ebe91964ffdc5e787a54a5d760aeefe14b6e0f85b37d813b8b0252c6206d94f. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/ITQ710800012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ed01c7c4e19fbf098ca526fd1316a0ef921d72dffeafa166a5601f71b2fce3f. 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/ITQ710800013.