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 0xf05a935893977a7485ae338ff64da7f6c6f2aa7b6ca16ddb5541973eaf175b57. 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/d850a703-336e-457a-a996-d26e9a8e3968.json and https://artists.proofprofile.net/proofs/artist/d850a703-336e-457a-a996-d26e9a8e3968.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 0x26f260decdc779ee83e1e56925ca733ee44c1f69a3065c410cdf035e152c178f. 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/US78Q0810024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x197a3ac1747e509c7496a02512ba18c7b11098bed27e0dbfea7d6218336529af. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/US78Q0810025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e17e56b434d3a122fdd167ffaac4d8822de77d7e8a729039e9832f969d7416e. 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/USA2B2102201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86950fd55c0c9105059df0e88c84b81e80de90d880a0e217fc6ec97348a27fe2. 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/USA2B2102202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8aa017da4bdbedd1a162f27ac0e25757979dbf3c00f8e89a47687a93e4a1f3e. 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/USA2B2102203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2e4302a4b8d48c7f4e4ae562e432bec1a52bede2ff274594fd3f484d3273d42. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/USA2B2102204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9f59d2688e3cfc15caade60490fe7357529eaafc6e5af860b7a919c60c530f3. 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/USA2B2102205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1eb7ac6d756238211680bdf5a32a181627e2a359980462848b45fd34538a74e0. 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/USA2B2102206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d3a3ed7cd27f1e3144277ccd0df78c0a86d98bd00dea023a94bdd1108bf583d. 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/USA2B2102207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9189e9762b3fd8476d164f0ad1fc50556aa2e05b0a581744c9437b544a58bfc5. 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/USA2B2102208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80ae73d933130fe167e40581d08bae838a3d4825b7320e602d3364e13ddf2f44. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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/USA2B2102209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0690d30b66e926ae3e1f1a74e685ccfd407976ec1b04207359a6c4e4faf82db8. 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/USA2B2102210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9189e9762b3fd8476d164f0ad1fc50556aa2e05b0a581744c9437b544a58bfc5. 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/USA2B2102208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9bdb261b02db88b2ce62cd7feb4480f2d1da2f880a9e6be4013065c55cd5942. 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/USA2B2102679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0690d30b66e926ae3e1f1a74e685ccfd407976ec1b04207359a6c4e4faf82db8. 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/USA2B2102210.