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 0x2f33f4e58fd12079b8373a4cee49f97ec4d6cd5095c19c4f69e4e940b056a9ff. 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/5d47244a-8204-415d-af77-c996a1474234.json and https://artists.proofprofile.net/proofs/artist/5d47244a-8204-415d-af77-c996a1474234.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 0x106aa5a1d65f1f91d9ec4d10e16a6e78f5afeab528dbcb53c6806dd1353fcc9a. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/TCJPS2294490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8656b62296fea4172a04cb1feb9b2f5636b7f91ddb1f23647c8df478ab2d758. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/TCJPS2294520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb12f08abc400c6f0dd978561c5a00189feefbf0a478ef4c1433e883a4e42666a. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/TCJPS2294534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58748c0addebd9f9b0f55bbb80173f7c2a46678f9c99ca7225fdc2590d7e6f86. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/TCJPS2294474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x035f3131e1eef75446d6592ca4a39c39f0bb54f761515fab891e7efaeb6a866f. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), 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/TCJPV2327177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cea33fb01c391911fd8d30b50a13131cc3cec46a5c383d54ca450758d2cf20c. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/TCJPV2327184.
此の世で一番碧い空 (feat. すずきつづみ)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x027f8ee42150137d81a39931fae38c8efdad7d51af457825bb073c8ca8701a57. 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/TCJPV2327193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd8b6b6f17b118e11525b158e7d707322b98735ba2ce49dc3244d13bc0c4044e. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/JPZ922307424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x693c4b542a686faa29be7eb9ca7114525a2d9d47181108f119ec9e0fb8c7bddd. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/JPZ922307422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52e76d84aa98957371bc090cf2e50ed9096a255af4c5daacc3ef63ac7f77ea39. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/JPZ922307426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07fa07c05e5997f9ba3b82c03a2a56a5d64d60410675e60a86675650edb09877. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/JPZ922307423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3c31d8b4c5885c682fab87fca3fbc5356b71f46e9d4b99c6104dc89545f3fbe. 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/JPZ922307421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3571c12dde1f91f7689da6aef146e63038153545ccd553cea4d3527fe5c11569. 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/JPY392301731.