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 0xd62038b8b3b8b50fdb8a5a3cb8a78f5d983c4bfb1b86de99ac3d79b9fd6826fe. 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/dd99e875-4495-41b0-b159-5ec986b41f2a.json and https://artists.proofprofile.net/proofs/artist/dd99e875-4495-41b0-b159-5ec986b41f2a.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 0x550cd7e212f4176834e2638bd14bbf74abb37cd36cd5ba0213d396e887b1594a. 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/QMR6U1500070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa318084d4fa0d4f2fbad873f5e908eb22924984d355a6ffbb3ccb39fae2dabb7. 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/QMR6U1700049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf501c2a1d1a3ee0d9c3160dfee5656965928ee8ba0d31c91db084c775444c515. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T21:16:09Z), 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/QMR6U1700051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeabfbe989f7c69b8f0fa489689761436670e6a592d4be9dcf488e46c646ad1a7. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/QMR6U1700053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61fab4cc16ef2e6b8cde5bbda7a46773ec7b0c5b13b200731b82d82a5f392a73. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T11:45:01Z), 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/US25X2200228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62b6f4ed293fb56da028d0723032cfc34a3af521c495a256d9490594932ca235. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T05:01:30Z), 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/GX4FT2304001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76871349a293b21e20218c4d0fbc940edfa188f091fd48869504853fa45fd096. 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/GX4FT2304003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31733d109ca1bfcef5130a047c52388c5dee6dd072974a065f15ce090eb76891. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/GX4FT2304004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x213b66609dd4cc1491c2d0fab16edf348b78930f0a3706f5337181da7dcd8990. 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/GX4FT2304005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45034364582d72d7f58ba9e9e5c2ef46d0f466a9a023d8b3cd441253c7b163e4. 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/GX4FT2304006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6bfd17bd96c59b5dc0a2f2bb228635df91e6ffd98e4a220a5c93bca589718c4. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/GX4FT2304007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0aebea84a2eec40e6692d0e8a615ea01375be46d5d206e7f12f063fc6a366dca. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/GX4FT2304008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec7af43c48ec836c7a38fe228e1e71f40f565ae2cad519766fc865bf23c2d64f. 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/GX4FT2304009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf994738ade6e6f8a0311d0400bd4662e4415d91433c6361b6edbbfdd9e49f289. 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/GX4FT2304010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7c106fd9116fc1a3783ea4ddd08e7e5ae9f6ed5697f4c7fabbcbe23f922e9ba. Chain 2 (Bitcoin): anchored in block 958196 (2026-07-15T20:38:50Z), 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/GX4FT2304011.