thumb|upright=1.45|Juba, Anglo-Egyptian Sudan in the 1930s Juba is the capital and largest city of South Sudan. The city is situated on the White Nile and also serves as the capital of the Central Eq
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 0xf049fe86bd2f6ba6e04e6679a389b4e60c45536cc851055a7c0b390e83b85b97. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e3fccf37-dee4-4370-9172-27fcae437f6f.json and https://artists.proofprofile.net/proofs/artist/e3fccf37-dee4-4370-9172-27fcae437f6f.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 0x276131249ec72492bbe7e0d3b5935120a07ad4a23adc2ff8f84df96c6e6fd61e. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/UST8K1646895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44d3ed77a84d5641a56e1d0120f706f14fa6219cdcd63fa1809436d3f7cad458. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/QMFME1409687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76de2493340f04ec0562cf836f076d3e1f6469e0842131bcd94b825b4b2165b0. 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/QMFME1409690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7150ddde69a596a371b80ed135211735955511b64721eec472cca2e203694bc. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/QMFME1409692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe0311dc1a61ceae5a5e85f0758e565f18b7bc21eb2e75422454d54abf1ae0d4. 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/EGA252407563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5ab024d9ca55dd83b4213c8818008d0f046d0ceff119bd7159c5de7fffb36f1. 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/EGA252407565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbffd6a1cf76999d3f408d9bc497d974e42100d62ae4d6c91e2a7b226fcfd84d0. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/EGA252407564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa4e0a8f82da3fca42db0e55df00d394cd387522abf0fc849145e8523b086c1b. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/EGA252408034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c1c65f678612b6331c28a842d8ec8990c9ff3fbc77ea4fc50fc2fe5119be335. 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/EGA252408035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb22f6b3588979e1a274960eb1534862c9e7d4ed5b5ea11184bbff66740f52b6b. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/EGA252408036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x275e07b7f255af5dd8b1bd632dc3aa7bcac3876dc36d7e6bf5c6ecc002ce4c93. 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/GBLFP2334569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b9370eaf2c7790007a25b648039226fae3c6cda91f35c9cc28ff1dbfbabb973. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZK6Q1922934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3a003d6e7c5a93c3e29b738c2af29e5189af639fb6df76a0bf39a6ff0255e29. 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/GBLFP2334568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb17af7c6d8e24b84269f6fae6996b6031df10173dd628bfc4ad698c61f7db86b. 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/QZK6Q1922936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9f20ad4c26b30b08812311f6b9f2a707934e70597c129beb1271b8a569be75c. 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/QMFME1588983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc2323860fcfa64a484f2c94d24d64663d0daef98c449b77cc7c1b5a4c8b0db5. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/QMFME1588985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73cbf9edb86211f3e421cadb6b845933a012e03d060debefb8eba1fae788011d. 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/QMFME1588990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fb94822326793a2cc55735f042f58f58b3fcadfc3a79b21ca518e6fe9cdcb91. 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/QMBZ91608164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa61f82b5de824c481366212e89ea1da4a64c8d12cef2b310d9d48ec777d107ff. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QMBZ91608166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71bc204669ceb8813005fb08fc244cca9cdfc5e68360ebd6a8c78132ca3b365d. 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/BXXFY2400039.