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 0xb208ea266e2cf945443113d7cd967942d7c11164978216cc3752d1f4d464240f. 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/a920faa6-48fb-4238-91ea-fd20eac5a7ef.json and https://artists.proofprofile.net/proofs/artist/a920faa6-48fb-4238-91ea-fd20eac5a7ef.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 0x629fbd85cafc8cb0294888d32811de565643a9602f937310ed98e27500dd2f6d. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/NOHMA1798010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0355204674334cdbef54ce15ea80fcb0dc5fa5b0daf3b6394f97de6deb4ab74e. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/NOHMA1798021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20e6a2837f49d2d62fda01e020afae230384dd58b3bd6faeddeeb1c5767c549f. 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/NOHMA1798050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcd5ba4b2c4d8137d10731eb7b3a320879a456ef2ce1c1370f6795eb1fe7ccdb. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/NOHMA1798110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe52f7f90038a13f11d2af7c837ab76b67b1bda98c116401c3ec4c166dcfdfcbe. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/NOHMA1798120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b485ea2cbc5a6d870f9cdfa540f65316c23cb99f76b8bce53caeca4ecfd3368. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/NOHMA1798150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda1a26d7e433031825be2a90c8222154be148817002dc0f16a3da6fcf6785ebc. 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/NOHMA1798160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e78e72c0bb1254a0c5e11737d320b459957cdb38e61161d8405f0efef8b033d. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/NOHMA1798170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeedc1816df904ee55b58259b9e78df89a32d8a23dea2f83352a5d2c60152f60f. 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/NOHMA1798180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21d54e23f9341a2ea61d2295159c86e38394e2634b622ef468431e1ea0c39fa1. 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/NOHMA1798190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde53a719506489de6b1fa4450fa65451ff86e0f95c5299b691cd8bee69f72ed9. 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/NOHMA1798200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ecad6b8a90235539cfdd0ee21e91c867bab36574dcdb6040e46fb2c8579f10f. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/NOHMA1798210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4618a5415182bc3f4789fec0ad33082cc691620085e3f85a0820b92eaca9c5c3. Chain 2 (Bitcoin): anchored in block 958051 (2026-07-14T19:14:42Z), 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/NOHMA1798220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8afe2da40345cd10609e4cc5e57e5628b23213925849a508f58a88d9da17fcd1. 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/NOHMA1798230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x985304c5ab57518d5288976832b631c222adc732e97697d18c92a8b84d225bcc. Chain 2 (Bitcoin): anchored in block 957776 (2026-07-13T00:05:10Z), 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/NOHMA1798100.