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 0x497b426db0d0d2770df17f5e61575c594d4adb81d839c404d15c947dd90c6cd2. Chain 2 (Bitcoin): anchored in block 953733 (2026-06-15T03:12:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/961c97bc-ba73-44c5-87b7-7b5597a01935.json and https://artists.proofprofile.net/proofs/artist/961c97bc-ba73-44c5-87b7-7b5597a01935.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 0xbfbc8ed89cdc8b400b4e9c74e0f485d2782f0407904d368ecf5467f41aba13e9. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/QZS7J2392002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdd675c9b507e20679b85a353b5fd5c731dd4cca5ae3d9e6a5c4b96f0f7aaa77. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/QZS7J2338698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac9b797bd604dcb2ec263183709339bc291c5b3a0a0234ecf17cd4d35cbc2c87. 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/QZS7J2381824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19c8c64555f903b110005b575d83001baa22736ca52c81a6831221a2e1552300. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/QZS7J2334549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x840efcb1aca4faa9edefe2c895e025000c632ed478cfc05ddcd7567558c37809. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/QZS7J2347944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c18550d9763e92e10c163bc4b5a87b0a749d1eb1d7a5ad7dc75f3375f2349f2. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/QZS7J2378116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf142e789af16d87aafb853888e62e2a3f2f1b2fdc3537e6555f4af6764b86959. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZS7J2336809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44a709cc52381a29603db81846598ffa6ba6815938092cdebe620f59238f58ca. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/QZS7J2361419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a487582047f6b974d7cfbeff5fb6df566caaa43456d0976213b8b8c670c4842. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/QZS7J2301801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x046c2ad9fa24141decdb5d283e80b9f13cdf059e83d2901e36d23b9ceb05bf63. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/QZS7J2340107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe10d9f454e718440db70635a4fdf861b38d0198becc38071f9df89e95e555932. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/QZS7J2391927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf88670ea22a5431d1c0e8ecf949940f7d979ef1472fc5fe6a1781bd3308ca9b8. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZS7J2366290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35340a97fafe267f69ea994d1c6d47f36c6dc9719303aa5c5925daeb4dce7f51. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZQAY2499807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x742c40640c9cdb373170928d90ce9ad69829b84a0d2a1cf7261a2a7f9505d953. 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/QZTAZ2496892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a000e0caa93e07a89567abaffad42fd9480be82ef07f15e45e914697a24e2e1. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZQAY2182874.