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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3d6fd20e6fb6e30685fcab0725525cac14e7e5bf78f87a192bda87891dc6459. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c8018552-8c5f-4e89-9c2e-0c024acb2d8a.json and https://artists.proofprofile.net/proofs/artist/c8018552-8c5f-4e89-9c2e-0c024acb2d8a.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b142dfdccb1008c78473c5cd8d8d91ef58d74c0e92237c5c1af9a9f357546ac. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/NLC241800209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53a089065e7509ed724ff502ad4810a2c54b5d35fe2d152ed7c4fab6fd9f5665. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLC241800210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed2acfc90c564aa129c6fa92c6a05a608db8cae8d64cbd136f0a202eb9473698. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLC241800211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x282e922812c2a49636eec840b542b79c6d255a259c040cdd1da2b8680fb495e9. 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/NLC241800213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64e75fbb9170144abfed5639cfabcc53d9da2940141b5f43841acddea92c3ee6. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/NLC241800214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74ce90c5087e2f0d8672f168bd60b4ac0dce463a24f037267efb0c91203cb6a8. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/NLC241800217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72f058934695b7c04320232cb78577adcd4f6d1b23d08bc5df08cd11bd915c71. Chain 2 (Bitcoin): anchored in block 957820 (2026-07-13T07:54:01Z), 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/NLC241600166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f8a1c25a11684acfd121e2a795a8a3ac94cd5ec5b36b6d982eed65037b008f0. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/NLC241600163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53ee2ca0f4ed94f1cc69ffc316575e49f3185f5551dc819ccd85d536270b40c4. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/NLC241600164.
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 0x0e3e2a2a74911f3666455eaff05e09484a2f04b5cefeb9b014b1d57f5dc30db9. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:31:41Z), 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/NLC241600169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2847c5dded7b7321fe852af3b3fccd405302b7ef69472500802f0a2ae71f74b. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/NLC241600170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a62f7140e84407092d591d53b4d0b91f59818c006b9c8122da7f1b849a11015. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/NLC241600167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07e524832a4161c640fe078a0e9a6c5febfd016ffd51a10fab101321a0c707b9. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/NLC241600168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fa443db725da0c7e34cd7bdd52db05fef08c222a4134cd86b33d063e326b456. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/NLC241600165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cc069fafa148bfb8e23f00ed4198678dd92c6e39f20514bdcc8ecbd25707436. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/NLC241600172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f0ec2fbf378f8e1a834c4b609f5ab1ceb8d52a2fd38dd2dcad7c6004fa5a0e2. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLC241900128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea3d9650811833395b3af401af5fd9afc51a8cc50344a77560033979dcef5d3c. 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/NLC241900131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac10871f3af1b63ef9aab3fa9a1985c6c20927d0d4d2e3225b200d957214902c. 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/NLC241700121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3677debe1d9db4bb7d9bd911ef1d3e3d833788d2f3b4daf025d5e22e733523be. 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/NLC241600254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69a88f6c7835973d98ef3e7cec7b959dec12649d915c369d9bb8f1b56bacbd2d. 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/NLC241500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x743dde14d1f8b9213c6b9acc1bdcfd83077c8999b9e8a2d41af43372234cd1f7. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/NLC241500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1986027f07124bc161b7226ad229006cb926e1e0b055d643ba3ece8d43276a1. 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/NLC241400103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4be866d02b856c405eb7f347225357dfa4310c84f27649b1a96676f676cad35. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLC241400076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bf990f29a13cae34ea7e1646db906b52560132528d14b1f45b142be330a139a. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/NLC242100926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc89362ed87bfac96fb159d7737e1892296481a1a5631ddcd9d4bfe59f620bf9e. 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/NLC242100381.