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 0x2f78592ab9c283fb3ad008b0dcd9687bb3cb3cf17414ad28fa63ae2f3e29715d. 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/c1a61aa2-56a1-4ef7-acd0-112659622da8.json and https://artists.proofprofile.net/proofs/artist/c1a61aa2-56a1-4ef7-acd0-112659622da8.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 0xfc02d01ded8770be69814d37c6f3646bfeabd5629d7108bac988d4bcfcf16725. 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/IL1001089578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e1504367119c9c2e9243555341091e9689665babfd947b71cf67faa19adf9e7. 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/IL1001089579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ebe15126c4dd1ea1e4caa9fc480bdfc168436243cea7ab9fabafe49b2072e15. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/IL1000001594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5addd2d4f23475626aea729e3ec0a3daa778589b5903fe94c79a2772b3b05471. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/IL1000001589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cc20c64793e43eac4232d7b4a727faea4f6d94e6b83577838d12b3a86ff0567. 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/IL1000001590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e3513b3c27dc146f0fbcc5244ac8e5b1872dff0be3445e60c6094a4e2f44903. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/IL1000001591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87c02faf536ca9674116bce9aa8de7afd763ca33cc2b6f5bd4ff627ddf3c61ce. 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/IL1000001586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x045ff7a9d72852b978a3af484f6aa53dbcd68d291a66bc76faefa35513b00798. 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/IL1000001598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x149b740db8761d76e77064bff6cf5a5fd9c35970de1d3609623a99756f4e80db. 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/IL1010101373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1874c5f3ae8a9a5c87d786703003594e2e9ee3cc07393590a8f912890036da70. 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/IL1010101366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a7134fa153ac632172e25872cc1a9543209ac5e4feb447b8e589ef020ac515e. 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/IL1010101387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4713bbbba046155ae7ecf1257e6bd9270c0fd7dd3ca0003883eba8f32aa7591. 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/IL1010101377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba286183119ffe69dc32692687cbdf8d692ecba48c61bb6c8e372bcc0530667f. 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/IL1010000103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73f987f45a36576808ce8ab3561258dcb686c244f36fa4ec99993095cde71ccc. 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/IL1010101384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3ab3528f02d02d8e883be2535bb657e2acc3d6e465cfab428beb8d821d9c3a7. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/IL1010101372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x754fe113501f11eb1370a66d9cb4373ac0ab4485dc694574e03404a9e428b8bb. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/IL1010101379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a1cd4bf8a4c5bf21187471e95eb8f7595fc0b4c7d68237097fcb33beef6052e. 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/IL1010101388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffe7ba82a4caff7842905cb2294ec7b0b3902f9d21567ca22a53cb389bcbedcd. 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/IL5260700214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5bef055b65b1761bccaa1f7789f7b4fcb6bfafb1b5b7e1c23e0cc91fc1dec06. 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/IL7112103211.