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 0xe6230b018fbbb3358a837efe4b5174f732dfa4f5b2246ed26c0d84a60696b529. 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/d9add6d1-f8cc-45f4-aae3-658512ea4995.json and https://artists.proofprofile.net/proofs/artist/d9add6d1-f8cc-45f4-aae3-658512ea4995.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 0x3f97eace793e037d9e435bba7fd16f5dc312a8ef76024c577c684bbb678fde02. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/DEPI82454700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x255ec8a1231a72eafe558176bf66edf1429dea45244827766bae79b45036e2bf. 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/DEPI82454701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xded5cded59bc55d9126d45221bb845fd6166bff2bec1ee208f12947b31864125. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/DEPI82454704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9472db4654de79c1dfdb0a3b558999064f1fef365cb67be3a640ada4574e8ac6. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/DEPI82454705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01b76ce8ac082e738573c4d806967f66c209887bae9002a2c8f9b9575736220e. 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/DEPI82454706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddc1c097d051d72e4e7d7664aa9d3547ec4a0336b427dca8b52c825fa5f6e5f4. 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/DEPI82457296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3416f6e427045656b4407cd72247aad58f093ff47f102238e9f6f8e7e75d11ed. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/DEPI82457302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3369fe91eac033d19e51bfb9e5a8535afb2e890097c0fe2b99c65c60e384bc7. Chain 2 (Bitcoin): anchored in block 958611 (2026-07-18T21:24:44Z), 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/DEPI82457294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dc4bc6ef04245988742be7c626aeb894f45bd104ebad85f1febcd8a2d49d393. 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/DEPI82457293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x934fb4f63ddee6717c33382e92ab2e2195bdc44d7d2a6096d11d96c502894c6c. 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/DEPI82457301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b7674d2343d9760bb536dd870b215dde145ecafed6678b9ae9e3919c34eb011. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/DEPI82457297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b5b97b08f5e62853cd7b3008de434ba32da30d9330ad4223543f1b1932b5888. Chain 2 (Bitcoin): anchored in block 958086 (2026-07-15T02:55:47Z), 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/DEPI82457300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa74d74f461e4af8e3856809dc9ef9ba8afba586104864ca676a2e59a6780aae6. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/DEPI82504936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c0cde47f27eac382ad168ee7b8a4d98fba92aeff415b6da8b2d15f7adfa3dbd. 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/DEPI82504935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ee6cd098d15033b7ae871f6b9a68f3eed4dfe06f6ca5fc2c6d32ed0db26a99f. Chain 2 (Bitcoin): anchored in block 958086 (2026-07-15T02:55:47Z), 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/DEPI82504934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6d79162aa96ffc3c48b271dcaf0e73eda10583ac8898d10476a5b5ec80140c4. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/DEPI82504933.