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 0xfb9fb880f242e01456fd793b4ab325e4fa3c301cefe6d9be5d573e3920431ef8. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/da73c5cd-5e81-4a9c-93d5-e1e0ce79829e.json and https://artists.proofprofile.net/proofs/artist/da73c5cd-5e81-4a9c-93d5-e1e0ce79829e.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 0x034c27f67fcb7b4591615ea65bd34c0917c1c619e4eb8ee0b5da9e2fb028d1df. 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/QZTBA2465283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d01f76f513404a18bc1ce1be7bd1813ae03e7130799577bb9de91aa3f78dbf7. 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/QZTB22427911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27af568e9f63c5d57fdc10262b928d0ea849d855aedd5fcb92e5e7f39727faf2. 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/QZNWZ2427669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf643d0e30f469073d94c3bdc2e319d01da53fbf1beb6200e900ec91a3ddcc886. 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/QZNWT2443858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87a56a4e662cad6d4407a8b59e26f4d2d0d3452424f5e80470c26b6c42f3a79c. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/QZDA82420351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cc91ff6d1dc8ae650aaa2642ad9c7f3ac7e3c645fb8c618155a8ecd43158d61. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QZTB32382176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94cb32f1fd25b602ad114da04792a54c291038af9425cac8f6047b67f40f9cb9. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZTB32303422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9efc8cd1efe69f8c1014613ff505f5ca30de00d3e2d6e8e23eb5ecb0f92300f4. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZTB42447803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44d196daba068f655118613135f59a02bdb4b1dfca627e5da3ae1cb9ad15e8de. 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/QZTB22421154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a6f3c5b71b8a7ac01649cee71293b6ac653de69336db69c96be6525a395a0d3. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZHN32490533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfa4e8c13c16c65f90842652850ab742c5d93e1500f158c48d2cc5227a573699. Chain 2 (Bitcoin): anchored in block 960383 (2026-07-31T09:50:37Z), 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/QZTAZ2240625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07f42dbcf6bb17abff3d61133829c66e64c653254169650c598623048fb6e0f5. Chain 2 (Bitcoin): anchored in block 957067 (2026-07-07T16:54:37Z), 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/QZHN42557781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad37dd005fb5c1ae71dfddbc6791615d23b8d100d466b1083c6c02187de324ef. 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/QZES52553473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd77d89e243163633281fb8437fe5f1876651ed3be1448b0bb77ec9de1814365c. 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/QZDA52594917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03733c8b295c901602cb49166faf4b32e3606fbc088d59c56c0aef4f9dfb8712. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZZ762461037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe008a82ea4b5e3cf9f1f34f8d40b5063fb7de15257d49a6bc9aecc35bf9fe0e6. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/QZWFQ2498681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8eca92d7bb26d4bbb68f91fe872005b1976abaff61c45cf08a9aef3f8d102d7c. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/QZHNC2398655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadb28e8640b91033d532edfe6595ab747c5b842a039a395a1dfa180fd5498f3c. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/QZNWT2372979.