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 0xcadc0587c5a5410941ca0d97e292e0ec8a974dbe4aeeeda746280f79d40ab1e9. 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/40041b53-89dd-4a6c-95e0-89f12fafa20a.json and https://artists.proofprofile.net/proofs/artist/40041b53-89dd-4a6c-95e0-89f12fafa20a.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 0x37a1ab6f3a97f3181b0651df99da7fa527649e904dd7a6c13f79bc1616b22fd9. 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/USTLV1000018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaf01756b3493bb9b29c437b57b7652abff7708372daccc93f4d3f9932893528. 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/USTLV1000020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf953ffa7981ec4625fe1c69445ecd4291691dcde761557731cbb782e80cb03e2. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/USTLV1000025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94b1f22e363034fdfc1e37f7411e8cb2b5d178b280fc3d149c8534662f73f8cc. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-22T00:16:02Z), 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/USTLV1800002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x455ebbce88e26427448ed658773be5e05126d4c0dcc67c1c7e6ef5d6dc19b471. Chain 2 (Bitcoin): anchored in block 957744 (2026-07-12T19:15:44Z), 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/USTLV1800004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12cc92cddddc1e221b7e3fa063117eaaca93af0de2e0db61a3d5d01199115cab. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/USTLV1800005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42845567d5cc2834c7ef9239074009e7a9889d12f9127dbd7e4c9d1d552f026b. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/USTLV1800007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1da21c473fef5a633c01b78b89e2c60d4dbf8fbf2fe1916176a79f22682ec0e4. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-17T03:46:47Z), 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/USTLV1800008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91ffbeeded32720d62bebe96faf91c329b34ecbb7d56cd0bf939eea8e39eb0c5. 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/USTLV1800009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde23f99c8bc65a26e93806520b9a39dc9d40509f1288105e994492ec4beaa95a. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USTLV1800010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58ba69396a3258c9eaf798489f6f9c3775b8e70e66b65e29ddea16a5031c32ab. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T11:25:39Z), 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/USTLV1800011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06c404f3c6ab1e1cda35739850d0f5bd6703ff37235a3e2efb124a0f4c92b66c. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/USTLV1800014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55a0bc033e4be5f7039544714825ad1f614f6b40c43e5d4f415cc0bfb0d9b4e8. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/USTLV2000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc75eb1d584e6f7f64b098bdf3e8c7f6767fce108598b78fdb350dfe56ba3acc5. 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/USTLV2000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55927614b998c13a40a101fc88880a076e833fafc5083e53e68af43c7a52d3dc. Chain 2 (Bitcoin): anchored in block 958491 (2026-07-18T04:29:42Z), 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/USTLV2000005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe74ebbe66ec362798d04af4287c69932948d7b098e5dada4f665a63edb73821b. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/USTLV2000006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd61defa006512a4d76f20132f69b6e8ff7a423014cbdd959ac390981b40f0b24. Chain 2 (Bitcoin): anchored in block 959091 (2026-07-22T02:33:54Z), 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/USTLV2000011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb03b97d42c37406bfe51087e8ccfd6395a4b77346d08c2f9a0229137d6c98d0. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/USTLV2000012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca3eead41dca8c30b6c5c67f31131a82e50dbaa4dcec8023f8233b0625919086. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/USTLV2100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd935a37446698173aa348d9ab164ee195fe8cf3428398c425e332e03b8caa8e3. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/USTLV2100005.
Famous (feat. The Columbia Academy Choir)