thumb|right|In The Signal by William Powell Frith, a woman sends a signal by waving a white handkerchief. A signal is both the process and the result of transmission of data over some media accomplis
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 0xf63407955c62ba3b8e480d4f4bf7ad1d56ebb86fc522a4d202eb444cec4e5d78. Chain 2 (Bitcoin): anchored in block 953699 (2026-06-14T22:00:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6f719551-0415-461b-b4bf-90f651933205.json and https://artists.proofprofile.net/proofs/artist/6f719551-0415-461b-b4bf-90f651933205.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 0x7699a9d3fdbe9123648d3ad42c0ebbb9eded8213bdb9de81aef5f3f7cf33c8bf. 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/US7MN1000205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bd6ecd26220588f34bd5c1b2928a5040e708fc19bf265eeb6f67d9d5f4c8857. 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/US7MN1000206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b7a8ae37fa07a38c076777e97321d4e2bbc4a2a8e124d2ff827c364d29a4cdd. 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/US7MN1000211.
Penelope: And Then You Shall Be Lost Indeed
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x353456639553eb8d91d732fd99920ef97635145ff1e701c79818832844d68cda. 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/US7MN1000212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x610c8b058ab2ecf5cea98574b6c5adb4ab7e347232ac38599e77bfc0c3028ce7. 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/US7MN1000213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe58e0ad3967eb4c8b59d5eb96af47a8cf8efe644a897cdf52ea3a90afb8a55ca. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/GBKPL1788877.
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
Penelope: The Stranger with the Face of a Man I Loved
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe418f54ac803e04531f3450580fc11516ff49aa07c5fe16b86ee9803b5fccb9. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/US7MN1000202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d401ee7ca9dc6908a8e8bf8cdc53c6c011e314f73644bf625500c24db421020. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/US7MN1000203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5c877e9af80d082bc339e0c6bd4e8015af562e0a63bbde82512b07919f3c1d4. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/US7MN1000204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88b6544a5902e2ac74141d6c0ca08c1a34f38f27bcc19415b02e951dc301e11d. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/US7MN1000207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9ece019d97c082c094696145cd012b1ea98b88fd601ff4a8bcc317c53b28738. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/US7MN1000208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85b8ab7b2b6a9befc80e4a5f8ae2722d39bedef460dc04b10ced23396b5ee913. 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/US7MN1000209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbec98e55d67d872744f0ae32cd93260a5af3cae5c43dc0d2533a5a8e08377f92. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/US7MN1000210.
Penelope: Baby Teeth, Bones, and Bullets
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7552d2060d2bf2922cb08b7f094b78e0c600fefe291ed3e95676af7fffca63b8. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/US7MN1000214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3113d722af68ac6bf3a52abea3e23702e9fcdb14610e886870f4196f9fad8cf. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/US7MN1000215.