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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 0xf3be184317db64f317fe8d95a35a589ec2ec4ac5cd83cfea31cd6c6d444f5b03. 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/ba537931-55af-41a5-b2a0-6b7874a4e42a.json and https://artists.proofprofile.net/proofs/artist/ba537931-55af-41a5-b2a0-6b7874a4e42a.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 0xcf6f64bd1a81ca1414a4462717ab5041ed62052d16f18fff8e4bfc9a8b36408c. 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/DEQ121750249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cf14564b65c43fced183c694fa6abced8ff5aec2023d4a4dba01d8512666ae3. 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/DEQ121750253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f58efebaf5084daae334f5be8e87b2e709aca249320095c152c5427aef8d8e6. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/DEQ121753467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e5aa395131ff40041bd7e5b75863a0a9c1dec453da1934c67b1ca840408948e. 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/DEQ021902992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb5947ae19c950383182b845e919ec655f6480fcbefb986bfa52f59400e00ceb. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/DEQ021903292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bd7b414c12f1fdafcc2f6e8eeb3e6487cdc19d3801670e2b05fb44d684818e9. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/DEQ021903296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8496f5937d9ad63d31d79266c03969ea821d4ac239d3d66b2c0a80c6bb527bf. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/DEQ021805667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfafa845fcf895b692781a11616987f8b56c337133bbb907f5c889f6b24891d46. 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/FR9Z61900273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x045b876bf8cd5c958db6e90120ac81b82a173704fd18e5b9815ef5acbbc2e58a. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/DEQ021912044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47fa24afef5b5a7742c65cdb4bb36ed4f07059383196d60143585f32ca8a8e9a. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/DEQ021912050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec52e1c95267e083c1235e6779e4ad65f263c44013a5b35d783acb61995dc24b. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/DEQ022002448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97c84e341db993e801040b201831e519cfe965a0e454e58c77ff5c39c5da4033. 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/FR6F32002050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7becc194af20b701320ef0eb7c75d2b0e92ccb391c469f07ce4694869545e60e. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/FR6F32100820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec52d17f8dbef91890d78d7d3993075df2a01756eb99d133801453a217a88389. 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/FR96X1651235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf959dc8a4c462514c205803f17d01a4a8a785cd0d8a0edc5105666ffa5bc66a. 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/TCACZ1795401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd84486ff67e928531d75e6060151bf60a327311e9bfa73e62f21f470e09e3cf. 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/FR6F32102520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16e3a64366f95b7414df445e169121547d9ff88ba4b83935fc12c12ec67ad9c1. 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/DEQ022002461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6800ed080fee875744213078f65409714b192d06cf468c7d3c75b36b7b0e0c16. Chain 2 (Bitcoin): anchored in block 958496 (2026-07-18T04:43:53Z), 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/FR6F32001910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x918367b1219f697ff3d29aa8f4d5ba99e6599526cfab0b2538144809f921f7c5. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/FR6F32405310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x006b7bf69b40e40fd9f7237b41d78b2e6d6da5120b3e5007802cc6952a7bdfdf. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/FR6F32405710.