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 0x76bc198e80bbb4c39669493e14f378ff5cdefaeb564df608fa3105063ed59eeb. Chain 2 (Bitcoin): anchored in block 953588 (2026-06-14T04:52:46Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/02acd01f-5a6e-4613-82cb-d5f13129c701.json and https://artists.proofprofile.net/proofs/artist/02acd01f-5a6e-4613-82cb-d5f13129c701.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 0xeed52edad0760dcfd0d4a87461447f0a4db3d03e9b8c2dcb960985a2c284d4db. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/SE5XG2254224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d5d91664702cda6c16383cb9c5dd4086dccbff7f947324ab9554452a85908a4. 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/SE57V2331301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9ba284f5b79ba1a23b591a8b7028dbebcb6e0b55c6e3e3f2a4a4705ccc98fb2. 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/SE57V2334401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ab87fc91e1eb1a27c06bcc8346f633a79c08abb47c6447d31814782482bb0ae. 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/SE57V2351801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f04031918a2925500e18b83bd88e053c7dda9a97ce74add5c679cd3826c54a6. 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/SE57V2351701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x838fb87fab808672911a5a019fd10c8ee373beea5785525d708c5c7af6f4477f. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/SE57V2359723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x662ae1d02ac992f4868ca775074949793e3f25603c54d06c74fbdf0408a24868. 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/SE57V2359724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x045fbd95c8d38597f887be20b8476adc4ea8c9038cec67e53ac63c9707195b01. Chain 2 (Bitcoin): anchored in block 958622 (2026-07-18T22:58:55Z), 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/SE57V2359725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01560752d3d87b1834bc00e1f5410043726009edbe0f4fb37985e04a24feafca. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/SE57V2359726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bccdc54b7d45b502bd278b31a0119a29c812f1d9d4037534039e7644895321d. 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/SE57V2359727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17bd7f10c631bd27767e7742904d97698770602ac17ee6bf67b3e1cdf30799b2. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/SE57V2359728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b8b8fcbc84002d1bbd8adac34114bf94743663e9531f6baf4d269661a2d4099. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/SE57V2359729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0afe8e9ae43cf606e9bd86be31a2c58a0f188c1eab7a8f40ac205e64b5954dd1. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/SE57V2359730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3fdb0f86cd350583dd12211272660d6896989f380703e8609b0f36cf43f1dc1. 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/SE57V2359731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8518ce8db29ecc6606f5a04cb611ca64168c9ebf1cdcbf8531aaa1ed68992350. Chain 2 (Bitcoin): anchored in block 958622 (2026-07-18T22:58:55Z), 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/SE57V2359732.