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 0xf63230ce94d45f8963530d5602ed869f8c97912ba4e66f66acb09c656ab10060. 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/942f0561-6794-4a59-a49e-e97dd6e51cfe.json and https://artists.proofprofile.net/proofs/artist/942f0561-6794-4a59-a49e-e97dd6e51cfe.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 0xa3b12b4130ac402255198404fd06b8f90e782ae4d4cdd3927d3892c87ade0c62. 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/QM4TW1950893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b5e6cfb363def4760567444e84c064444d4156df3bb63d87c53151a75434fac. 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/QM4TW1950894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xece95ee0c906848bb5acdfaa3b8419c14076094cf6828e71db029fff8408e299. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QM4TW1950895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8012e8cc59e1a7702dd8f54e406a54fca777dcf717f6740e48a70c11033e35d1. 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/QM4TW1950896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed77612ad7845deaf4b91ddfc5bac3772b9c503de64a4fde964be0d00edda117. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QM4TW1950897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x876851a629111497dd2749266823ead12f36e6c2efc6ec54dc818056195413e4. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QM4TW1950898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54d23d3f86dfee6cd2a9813f04aec6c0bd80b1650db3c16e810b241b34b38948. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QM4TW1950899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa85ae6b544931aff44ed8d1512327eeac9982e56e6b01c913aebb07414a1f7eb. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/QM4TW1950900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5580ae78cb36c07e9cf3b894588a12efaeb3d2efb1ce58c46363a98d4199581. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/QM4TW1950901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d714751fc6cce6f8f932b0b568359fb7774fa140eb612962c729992d4a417d1. 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/QM4TW1950902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c5c2d988dfacfaa09d1e5546f93ebc0d71a56c15810fa3d26a658955e158c48. 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/QM4TW1950903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeb52684d822635e0772f4aa5aba555e2b5f8bfb51bbe1e1f22f648f8674fc1e. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QM4TW1950904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdbf8892efd0db39178a2a59241b47f66a0e4e2da2df12167b82301ebcbe785c. Chain 2 (Bitcoin): anchored in block 958756 (2026-07-19T16:12:29Z), 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/QM4TW1950905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2216bd6f65366e92a5d124b8d27d49d5dd8f27b9d0079e26c934ac8c9e6fe871. 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/QM4TW1950918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7723c25d7be2a62514dd74bb9133848e3a5e70c74fd8e4e50ec45bbf5c6da86. 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/QM4TW1950919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb3208bf24d8e68eaba7b29e730b8386c4eb96617e7f9d8c5c6c2f1d2a299f9b. 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/QM4TW1950922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x527684498b0d7ef8819fcbf5b67e2c006571c0c42d29c97ebfc965ee6498c813. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QM4TW1950925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x708344905cb5d4c20f24125f295673dc77a177d05b4a92ae3e8e65515038a578. 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/CA5KR2037179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4dd39420eae0b624158d61757cc61add87efc4456334b016dfc57f7c12c1b7b. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/CA5KR2037184.