The Sumpa () were a tribe living in northeastern Tibet from ancient times. Chinese historical sources refer to them as "Qiang", a term for people living in what is now southwest China, and their actua
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e2ec82def642369796fb5727d15435ae50f03486795cdae9ec7042d8c41f8d3. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5aa1e07f-4733-4f05-a513-71e1641c2680.json and https://artists.proofprofile.net/proofs/artist/5aa1e07f-4733-4f05-a513-71e1641c2680.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf09ada426d281c245709924e4cc8fc9b0df0cbdbd4e1b9058949af65d58bee5e. Chain 2 (Bitcoin): anchored in block 958666 (2026-07-19T05:00:30Z), 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/GBKPL1978512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bcc2e4ba49f533d557194eaf5e73e7f65c84fb00302a3ed7f1d64aa59ea77d1. 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/DELJ82064039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30f957a514dfd814a656a6a7ad9765e769c7d9db8763be75c160d3262d29ed41. 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/DELJ82069020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9116cb3d98bf04b4337530e243c89454f0f0475cf07d68452214e58928d26d90. 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/DELJ82069021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71e9f9c6b9b23a53d7669c9eaacab9a4d64d1ba717625ab2578c5ee4c92467c1. 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/DELJ82069022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe096f494a3225597c3b169eb4bf3debb1373626fc2975ceb4907689cd867584c. 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/DELJ82069023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x004ed724b68f88e8bd290f978b9db20a39266e65536a2e06956eb8450e42a7da. 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/DELJ82069024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b6988ea7506c95b87d2194989c4700c7903c661d950bbeacbbb68d9f02ba5b9. 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/DELJ82022337.
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 0x24e725dd79691483a3a3eeed4ebaf5348d994b7132cdad22bd1e94db5ab6cc7b. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/DELJ82069025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3785ce96d98bbc05af681d199d19ad6aad28c6ec7a8a2a1b63112d7c629992b0. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/DEZC62166403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bd816a99dab5aa36b6e0b65daa879d40d401e0d7c37efec3b6b1b5c25e1ac0f. 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/DEZC62105062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb261c0a27b5926dc98fc23035d19ddb22079a7b1190614d5f93b086e1e79e382. 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/DEZC62105064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa177b1a93ca9415c00d115363ab005469cc586ba6e2abeb0ac4959d0f6f955e6. 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/DEZC62105065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a9e6554888fabc052b36f819ace1c739b0a5f0ac0733e96d2eaf3388509b9d7. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T17:45:24Z), 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/DEZC62118962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61ea98ca5087c59b5de685812e0121a720550bb1a1472b5d98d5743d69fe7215. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/DEZC62105063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc88c6bb0f2132276412517b33efa3f8cde9358859a442c3c79c2e482b06eec7e. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/DEZC62104583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4350ed9df9ad508447e20d5c5880bb5d632315a8576afeaad766a09466bc2a0. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/DEZC62251660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c4b6e880566fe197500ab5bc11b953a3399f95f73262baabf28472d4f4f0a11. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/DEZC62322852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58abe71cb619329be8487be110e237977e526a0ac6873002691272803c302ccc. 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/DEZC62327018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a2a9ef9a858cd97bef6664a0260445832271731b8f0f9127a66949655fc3636. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/DEZC62327017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ae9aab98e5119b2cde0770a8beeee7e807b0011a1128081e44d96b74bcd5b34. 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/DEZC62381855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2defe3befbc8887214975041436b4b9c9d3e1e4ba2cc6caf0d0a1217d4fbd59e. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DEW922101616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6239a0cdd1fbd549a2748b5f6e83d3d03a5cd98d678f8a2c55cadfe7663e06a5. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZDA72513340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x727f5ff603b8882cc6a48f852d2d8a9ecc7cef083ce43c511488054db7b099c5. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DEW922301833.