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 0x264930e2fb88721c49b102776c1350683c09bd62ad419db14b6df8d802836139. 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/8dd98438-9d12-4c76-ba5a-7a4571ea8838.json and https://artists.proofprofile.net/proofs/artist/8dd98438-9d12-4c76-ba5a-7a4571ea8838.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 0xc1dd4c349e374242d01ca4ab2494b414822cd3f697c2c2d32c4092090285dc4b. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/QZNWX2251542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebf9c2e4178d50e20b35ee0c76f2cafe71e100b95cc44df5fc9e9e3ee0a85c44. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZPLR2241297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x715c64a3ee3c859bbf347f03bb2134c26130bf2e2913a1e714f0382d3dc0423f. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QZTBA2293700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfa5c76e33a386421442f3cc45884b8f6b202ccc2191528b35ad656f4fdbff73. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/QZFZ42390387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bb5d6ab13ba677ebb3e93a3b6281b030a94d3abfd7393dc6695d42128c70316. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZHN72355511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c7bc72cff1598987a27cdffeb6f94c6f05369b11009541bc3b2c27468462200. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/QZHN72358925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa34c1f6a0f21f9da2d8e429fc71e027db46e4e9a22face07e702acf40475856c. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZK6Q2339116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe707960ef6a2af3a05e4f72c74995669199a6cd0d2860d07fba08fbe6764e26. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZK6Q2339117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a55ece4d5f1bc6da5f4928192da70c339b67b03c44f2434e5097577fbb63be3. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/QZK6Q2339118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99b0f027be69ceb42233d98d9a6f51da1037b39c33ce1d0e82a4787a1c0d11d5. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZK6Q2339119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c770490094093117e68bf89df33520c52ff61714a713acd8e202a70a7976f82. Chain 2 (Bitcoin): anchored in block 958590 (2026-07-18T17:28:56Z), 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/QZK6Q2339120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8acf2ca57f47bcfea5e03f96c73c371aa07292ea5d97296f1d22bc2a551e77ee. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZK6Q2339121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d76575fa35c83a81c3c3a0a3d7ea71680bb09cdfafb4435a1cafda26e2ec5a5. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZK6Q2339124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa313dc852606e0f39fbee32fa0cec73fdaf88ce47db4d008c633f11ae99ff812. 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/QZHNB2434934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc739bcaeafc540b934249f062d482a9b66292dfa76c3c96f6b3ceeb0596b083f. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/QZMER2433771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b8616adfd5a15c4740bf688b018428730e3ecd990d05e443347235fd4ab1302. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZNWU2456569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x076ae0d569baed5c8e4734de0c72e11017b4bd1a369151a710e5cafd273511d2. Chain 2 (Bitcoin): anchored in block 957564 (2026-07-11T12:19:47Z), 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/QZPLR2474651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9765ec60526e2c14623853462b7c4f0d8a8f5f1b3533a7b284e1e615a72bc4dd. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/QZPLR2478114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92512155e010d6d34a42bcd9567e9c4509f535e422dfae88797f77f2724bbcdb. Chain 2 (Bitcoin): anchored in block 958656 (2026-07-19T04:04:08Z), 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/QZTB42432145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92512155e010d6d34a42bcd9567e9c4509f535e422dfae88797f77f2724bbcdb. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/QZTB42432145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb0230556458adf978c9d3e82e5f37ee3d80a44ea62972809dc9c234cc9f5061. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/QZHN32501985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3370d33fa68a0cc6e7a8a4b21f3d1480fb24dc7800bbce9e6cce041594ccdc5. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZK6H2525469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfee70f7123b958929e2b643da4f8e1cac295e8f584dd70d06ab71797b151f433. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZRP42528559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02bcd57c7b5cb9fc8cc17b96f8d89524eaffd57481caecca5cca089de0358c81. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/QZRP42534740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebf14d744dcfdf18850ae160818cfb953d5882aa4f9008090f81d30f863c3fad. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZRP42534746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc565b0f0bf8bf6ca8541134a949f05e82be9becc41c4176d15ccdf1c9c2de548. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZTBC2455165.