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 0x8c25716a90a7b2a24407aac951605b7cded5a3dbed804bd7f718b4df27311368. 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/1fe87d9c-7b9f-4c6b-a2db-cac6293f75e7.json and https://artists.proofprofile.net/proofs/artist/1fe87d9c-7b9f-4c6b-a2db-cac6293f75e7.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 0xcfc18d45d4dea5c1a9825006efe8a867076314c945612af4f1ceb3a27f82c691. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/TR0511002380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6a59dbab00a3e891449d184b9d7bf3da8eaedc891610338ef9fd656f8852d02. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/TR0511002381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87562af1ac50942c4bbd44749d8db9a111ef1ba109c0178ee4bbad5fbf16bf81. Chain 2 (Bitcoin): anchored in block 959009 (2026-07-21T13:14:47Z), 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/TR0511002383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x200caeafe5eb3cdf22603b362b5f5b811b35b5b826a595e71b81aff8780868ef. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/TR0511002385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea7e43a47aa91a8afcffa5675470f1c1c129c1ddefda579ad1b1009cb9712f61. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/TR0331610572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c19860c9eb71c2175c6c104cf34131902f03ff31eae714539202d7317743a69. 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/TR0331610575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4dd16f010bd1e34b6c681148f3e8806bd81017cf0a5bc2dd047fa4885d9e977. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/TR0331610570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e584bbbe2e9a394bb0c19a63ff149a1201573bd78704023cd8dbc8c64ed59d3. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/TR0331409870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1498d6680373cc5614ff0aae07f87ea61e7e4a7fcf26de4877988fb0e96fafe. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/TR0332112710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacf689b4e6394be7acb168df900859d380bab43e338e15af1142959fba861bd5. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/TR0332112709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78d2701704898d2acebd499d6374ce71bf2ec1cba8e18bd875fcc33845f76d65. 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/TR0332112701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b53cde1b6c4ed9ea53f28b8335a3b92f827f1e542f3b3db710cc6289351c860. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/TR0332112706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ec61556c31ee178b7d462511de0f9c02d775660758a39363fe6278f9fbf8d06. Chain 2 (Bitcoin): anchored in block 958417 (2026-07-17T12:56:50Z), 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/TR0332112708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8df5fb8b4037878a9a62e5b3921422e37de5aa768428cb1bfc64516a20ab7d4d. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/TR0332112704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7980ae25e483384e54d4159ef134ace4adbb016c5875f8f83ebab44f8a1f3e81. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/TR0332112707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0ff13dfff5c947d9d1fa4c21c5cd51d27f71f1ddc434b4e318e499905d9792b. 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/TR0332112703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e584bbbe2e9a394bb0c19a63ff149a1201573bd78704023cd8dbc8c64ed59d3. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/TR0331409870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2dd6f9fdab3973e3f1b179d0fa8000685102512cf0bc5677e8922d07d4246d6. 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/QZWFS2419651.